diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
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+  Developers that use the GNU GPL protect your rights with two steps:
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+covered work, you indicate your acceptance of this License to do so.
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
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+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
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+patent against the party.
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+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
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+conveyed by you (or copies made from those copies), or (b) primarily
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
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+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
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+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
+  To protect your rights, we need to prevent others from denying you
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+certain responsibilities if you distribute copies of the software, or if
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+  Developers that use the GNU GPL protect your rights with two steps:
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+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
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+  "This License" refers to version 3 of the GNU General Public License.
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+  The "source code" for a work means the preferred form of the work
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+  You may convey a covered work in object code form under the terms
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+add to a covered work, you may (if authorized by the copyright holders of
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+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
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+
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+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
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+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
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+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
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+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
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+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
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+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
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+produce the work, or an object code interpreter used to run it.
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+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
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+which are not part of the work.  For example, Corresponding Source
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+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
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+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
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+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
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+  Conveying under any other circumstances is permitted solely under
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+makes it unnecessary.
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
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+
+  4. Conveying Verbatim Copies.
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
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+  5. Conveying Modified Source Versions.
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+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
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+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
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+    b) The work must carry prominent notices stating that it is
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+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
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+    permission to license the work in any other way, but it does not
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+  All other non-permissive additional terms are considered "further
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+received it, or any part of it, contains a notice stating that it is
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+a further restriction but permits relicensing or conveying under this
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
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+reinstated, you do not qualify to receive new licenses for the same
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+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
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+                     END OF TERMS AND CONDITIONS
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+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
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+"recipients" may be individuals or organizations.
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+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
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+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
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+to the extent that it includes a convenient and prominently visible
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+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
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+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
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+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
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+same work.
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+  All rights granted under this License are granted for the term of
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+  You may convey verbatim copies of the Program's source code as you
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
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+System Libraries, or general-purpose tools or generally available free
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+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
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+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
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+works, which are not by their nature extensions of the covered work,
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+used to limit the access or legal rights of the compilation's users
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+in an aggregate does not cause this License to apply to the other
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+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
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+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
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+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
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+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
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+
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+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
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+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
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+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
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+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
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+
+    a) Convey the object code in, or embodied in, a physical product
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+    copy of the Corresponding Source for all the software in the
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+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
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+    c) Convey individual copies of the object code with a copy of the
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+    only if you received the object code with such an offer, in accord
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+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
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+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
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+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
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+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
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+doubtful cases shall be resolved in favor of coverage.  For a particular
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+typical or common use of that class of product, regardless of the status
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+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
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+  "Installation Information" for a User Product means any methods,
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+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
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+
+    d) Limiting the use for publicity purposes of names of licensors or
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+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
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+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
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+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
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+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
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+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
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+for you must do so exclusively on your behalf, under your direction
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
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+the covered work, and you disclaim any intention to limit operation or
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+users, your or third parties' legal rights to forbid circumvention of
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+  4. Conveying Verbatim Copies.
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
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+  You may convey a work based on the Program, or the modifications to
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+terms of section 4, provided that you also meet all of these conditions:
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+    a) The work must carry prominent notices stating that you modified
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+    b) The work must carry prominent notices stating that it is
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+    7.  This requirement modifies the requirement in section 4 to
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+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
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+    invalidate such permission if you have separately received it.
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+    d) If the work has interactive user interfaces, each must display
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+  You may convey a covered work in object code form under the terms
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+    conveying of source, or (2) access to copy the
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+    d) Convey the object code by offering access from a designated
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+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+  8. Termination.
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+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
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+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+reinstated permanently if the copyright holder notifies you of the
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+received notice of violation of this License (for any work) from that
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
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+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
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+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+propagate the contents of its contributor version.
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+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
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+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
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+  A contributor's "essential patent claims" are all patent claims
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+patent license under the contributor's essential patent claims, to
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+consistent with the requirements of this License, to extend the patent
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+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
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+country that you have reason to believe are valid.
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+receiving the covered work authorizing them to use, propagate, modify
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+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+
+  Developers that use the GNU GPL protect your rights with two steps:
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+giving you legal permission to copy, distribute and/or modify it.
+
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+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
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+
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+  The precise terms and conditions for copying, distribution and
+modification follow.
+
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+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
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+
+    d) Limiting the use for publicity purposes of names of licensors or
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+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
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+  12. No Surrender of Others' Freedom.
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+  13. Use with the GNU Affero General Public License.
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+  Notwithstanding any other provision of this License, you have
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+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
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+  If the Program specifies that a proxy can decide which future
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+
+  Later license versions may give you additional or different
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+  15. Disclaimer of Warranty.
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
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+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
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+feature that (1) displays an appropriate copyright notice, and (2)
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+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
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+menu, a prominent item in the list meets this criterion.
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+  The "source code" for a work means the preferred form of the work
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+same work.
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+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
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+in force.  You may convey covered works to others for the sole purpose
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+  When you convey a covered work, you waive any legal power to forbid
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
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+  "Additional permissions" are terms that supplement the terms of this
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+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
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+  When you convey a copy of a covered work, you may at your option
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  You may not propagate or modify a covered work except as expressly
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+  9. Acceptance Not Required for Having Copies.
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+  You are not required to accept this License in order to receive or
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+  10. Automatic Licensing of Downstream Recipients.
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+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
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+
+  A contributor's "essential patent claims" are all patent claims
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+hereafter acquired, that would be infringed by some manner, permitted
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+patent license under the contributor's essential patent claims, to
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
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+pattern of such abuse occurs in the area of products for individuals to
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+
+  Finally, every program is threatened constantly by software patents.
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+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
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+  "This License" refers to version 3 of the GNU General Public License.
+
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+  You may convey verbatim copies of the Program's source code as you
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
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+
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+    Notices displayed by works containing it; or
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+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
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+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
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+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
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+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
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+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
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+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+giving you legal permission to copy, distribute and/or modify it.
+
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+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
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+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
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+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
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+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+giving you legal permission to copy, distribute and/or modify it.
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+authors' sake, the GPL requires that modified versions be marked as
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+
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+
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+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+want it, that you can change the software or use pieces of it in new
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+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+
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+giving you legal permission to copy, distribute and/or modify it.
+
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+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
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+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+
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+giving you legal permission to copy, distribute and/or modify it.
+
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+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
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+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
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+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  All other non-permissive additional terms are considered "further
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+received it, or any part of it, contains a notice stating that it is
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+a further restriction but permits relicensing or conveying under this
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  You may not propagate or modify a covered work except as expressly
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+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
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+occurring solely as a consequence of using peer-to-peer transmission
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+  10. Automatic Licensing of Downstream Recipients.
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+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
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+  You may not impose any further restrictions on the exercise of the
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
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+hereafter acquired, that would be infringed by some manner, permitted
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+but do not include claims that would be infringed only as a
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+patent license under the contributor's essential patent claims, to
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+  In the following three paragraphs, a "patent license" is any express
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+  If you convey a covered work, knowingly relying on a patent license,
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
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+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
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+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
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+  "The Program" refers to any copyrightable work licensed under this
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+  A "covered work" means either the unmodified Program or a work based
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+any patent claim is infringed by making, using, selling, offering for
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+
+  11. Patents.
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+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
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+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
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+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
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+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
+
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
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+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
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+pattern of such abuse occurs in the area of products for individuals to
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+avoid the special danger that patents applied to a free program could
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
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+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+    f) Requiring indemnification of licensors and authors of that
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+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+not survive such relicensing or conveying.
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+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
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+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
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+your receipt of the notice.
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+  Termination of your rights under this section does not terminate the
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+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
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+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
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+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
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+
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+    Copyright (C) <year>  <name of author>
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+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
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+
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+  If the program does terminal interaction, make it output a short
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+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
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+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
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+
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+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+giving you legal permission to copy, distribute and/or modify it.
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+authors' sake, the GPL requires that modified versions be marked as
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+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
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+earlier work or a work "based on" the earlier work.
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+  A "covered work" means either the unmodified Program or a work based
+on the Program.
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+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
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+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
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+
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+  The "source code" for a work means the preferred form of the work
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+same work.
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+  2. Basic Permissions.
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+copyright on the Program, and are irrevocable provided the stated
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+measure under any applicable law fulfilling obligations under article
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+users, your or third parties' legal rights to forbid circumvention of
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+keep intact all notices of the absence of any warranty; and give all
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+  11. Patents.
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+consistent with the requirements of this License, to extend the patent
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+actual knowledge that, but for the patent license, your conveying the
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+section 13, concerning interaction through a network will apply to the
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
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+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+software and other kinds of works.
+
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
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+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
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+in a fashion requiring copyright permission, other than the making of an
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+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
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+computer or modifying a private copy.  Propagation includes copying,
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+parties to make or receive copies.  Mere interaction with a user through
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+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
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+  The "source code" for a work means the preferred form of the work
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+same work.
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+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
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+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
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+for you must do so exclusively on your behalf, under your direction
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+any patent claim is infringed by making, using, selling, offering for
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+
+  11. Patents.
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+License of the Program or a work on which the Program is based.  The
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+  A contributor's "essential patent claims" are all patent claims
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+consistent with the requirements of this License, to extend the patent
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+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+want it, that you can change the software or use pieces of it in new
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+
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+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+giving you legal permission to copy, distribute and/or modify it.
+
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+authors' sake, the GPL requires that modified versions be marked as
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+licenses of parties who have received copies or rights from you under
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+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
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+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
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+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
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+menu, a prominent item in the list meets this criterion.
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+  The "source code" for a work means the preferred form of the work
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+same work.
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+  All rights granted under this License are granted for the term of
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+convey, without conditions so long as your license otherwise remains
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+similar laws prohibiting or restricting circumvention of such
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+users, your or third parties' legal rights to forbid circumvention of
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+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
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+terms of section 4, provided that you also meet all of these conditions:
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
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+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
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+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+reinstated permanently if the copyright holder notifies you of the
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+  Termination of your rights under this section does not terminate the
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+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
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+  You may not impose any further restrictions on the exercise of the
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
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+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
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+giving you legal permission to copy, distribute and/or modify it.
+
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+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
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+
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+
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+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
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+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
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+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
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+option of following the terms and conditions either of that numbered
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+Foundation.  If the Program does not specify a version number of the
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+
+  If the Program specifies that a proxy can decide which future
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+  15. Disclaimer of Warranty.
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
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+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
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+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
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+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
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+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
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+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
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+  "Additional permissions" are terms that supplement the terms of this
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+  9. Acceptance Not Required for Having Copies.
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+  You are not required to accept this License in order to receive or
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+  10. Automatic Licensing of Downstream Recipients.
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+  Each time you convey a covered work, the recipient automatically
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+  You may not impose any further restrictions on the exercise of the
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
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+but do not include claims that would be infringed only as a
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+patent license under the contributor's essential patent claims, to
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+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
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+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
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+country that you have reason to believe are valid.
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+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+the work, and under which the third party grants, to any of the
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
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+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
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+
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+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
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+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
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+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
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+produce the work, or an object code interpreter used to run it.
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+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
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+can regenerate automatically from other parts of the Corresponding
+Source.
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+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
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+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
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+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
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+measure under any applicable law fulfilling obligations under article
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+similar laws prohibiting or restricting circumvention of such
+measures.
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+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
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+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
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+  "Additional permissions" are terms that supplement the terms of this
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+apply only to part of the Program, that part may be used separately
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+  9. Acceptance Not Required for Having Copies.
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+  You are not required to accept this License in order to receive or
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
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+patent license under the contributor's essential patent claims, to
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+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
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+receiving the covered work authorizing them to use, propagate, modify
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+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
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+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
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+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
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+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
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+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
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+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
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+any patent claim is infringed by making, using, selling, offering for
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+
+  11. Patents.
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+License of the Program or a work on which the Program is based.  The
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+  A contributor's "essential patent claims" are all patent claims
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+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
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+  9. Acceptance Not Required for Having Copies.
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+  10. Automatic Licensing of Downstream Recipients.
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+
+  11. Patents.
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+consistent with the requirements of this License, to extend the patent
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+
+  A patent license is "discriminatory" if it does not include within
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+conditioned on the non-exercise of one or more of the rights that are
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
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+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
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+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
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+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+
+  Nothing in this License shall be construed as excluding or limiting
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+  12. No Surrender of Others' Freedom.
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+  13. Use with the GNU Affero General Public License.
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+  Notwithstanding any other provision of this License, you have
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+  14. Revised Versions of this License.
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+  If the Program specifies that a proxy can decide which future
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+  15. Disclaimer of Warranty.
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
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+  If you develop a new program, and you want it to be of the greatest
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+Also add information on how to contact you by electronic and paper mail.
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+The hypothetical commands `show w' and `show c' should show the appropriate
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+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+  Nothing in this License shall be construed as excluding or limiting
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+  12. No Surrender of Others' Freedom.
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+  If conditions are imposed on you (whether by court order, agreement or
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+  Notwithstanding any other provision of this License, you have
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+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
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+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
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+convey, without conditions so long as your license otherwise remains
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+similar laws prohibiting or restricting circumvention of such
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+  You may convey verbatim copies of the Program's source code as you
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+  A "User Product" is either (1) a "consumer product", which means any
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+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  Notwithstanding any other provision of this License, for material you
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+that material) supplement the terms of this License with terms:
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+  All other non-permissive additional terms are considered "further
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+received it, or any part of it, contains a notice stating that it is
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+a further restriction but permits relicensing or conveying under this
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+  Additional terms, permissive or non-permissive, may be stated in the
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+  You may not propagate or modify a covered work except as expressly
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+  Termination of your rights under this section does not terminate the
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+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
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+modify any covered work.  These actions infringe copyright if you do
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+  10. Automatic Licensing of Downstream Recipients.
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+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
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+  You may not impose any further restrictions on the exercise of the
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+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
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+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+  In the following three paragraphs, a "patent license" is any express
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+  If you convey a covered work, knowingly relying on a patent license,
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
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+receiving the covered work authorizing them to use, propagate, modify
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
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+
+  Nothing in this License shall be construed as excluding or limiting
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+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
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+
+  If the Program specifies that a proxy can decide which future
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+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
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+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
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+convey, without conditions so long as your license otherwise remains
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+for you must do so exclusively on your behalf, under your direction
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+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
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+circumvention of technological measures to the extent such circumvention
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+  You may convey verbatim copies of the Program's source code as you
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+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
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+Corresponding Source conveyed under this section must be accompanied
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+modified object code on the User Product (for example, the work has
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+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
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+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
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+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
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+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
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+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
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+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
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+  However, if you cease all violation of this License, then your
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+provisionally, unless and until the copyright holder explicitly and
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+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
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+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
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+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
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+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
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+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
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+  9. Acceptance Not Required for Having Copies.
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+  10. Automatic Licensing of Downstream Recipients.
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+  11. Patents.
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+  A "contributor" is a copyright holder who authorizes use under this
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+  A patent license is "discriminatory" if it does not include within
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
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+
+  14. Revised Versions of this License.
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+  The Free Software Foundation may publish revised and/or new versions of
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+  Each version is given a distinguishing version number.  If the
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+  If the Program specifies that a proxy can decide which future
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+  Later license versions may give you additional or different
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+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
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+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
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+    This program is free software: you can redistribute it and/or modify
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+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
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+
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+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
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+
+  Developers that use the GNU GPL protect your rights with two steps:
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+giving you legal permission to copy, distribute and/or modify it.
+
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+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
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+
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+
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+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
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+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
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+
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+    Copyright (C) <year>  <name of author>
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+    it under the terms of the GNU General Public License as published by
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt b/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
deleted file mode 100644
index 5a6b73a..0000000
--- a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.lukas.music
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}
\ No newline at end of file

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
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+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
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+pattern of such abuse occurs in the area of products for individuals to
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+stand ready to extend this provision to those domains in future versions
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+
+  Finally, every program is threatened constantly by software patents.
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+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt b/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
deleted file mode 100644
index 5a6b73a..0000000
--- a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.lukas.music
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bf99e36..4be99ea 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application' version '7.2.1' apply false
     id 'com.android.library' version '7.2.1' apply false

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
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+                     END OF TERMS AND CONDITIONS
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+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt b/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
deleted file mode 100644
index 5a6b73a..0000000
--- a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.lukas.music
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bf99e36..4be99ea 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application' version '7.2.1' apply false
     id 'com.android.library' version '7.2.1' apply false
diff --git a/gradle.properties b/gradle.properties
index 0dee8cb..eea5a90 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,12 @@
+#
+# Copyright (C) 2022 Lukas Eisenhauer
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 android.useAndroidX=true
 kotlin.code.style=official

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
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+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
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+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
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+earlier work or a work "based on" the earlier work.
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+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
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+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
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+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
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+
+  Additional terms, permissive or non-permissive, may be stated in the
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+  8. Termination.
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+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
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+this License (including any patent licenses granted under the third
+paragraph of section 11).
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+  However, if you cease all violation of this License, then your
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+holder fails to notify you of the violation by some reasonable means
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+reinstated permanently if the copyright holder notifies you of the
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+received notice of violation of this License (for any work) from that
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
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+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
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+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
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+propagate that work, subject to this License.  You are not responsible
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+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
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+the predecessor has it or can get it with reasonable efforts.
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+  You may not impose any further restrictions on the exercise of the
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+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
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+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
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+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
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+propagate the contents of its contributor version.
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+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
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+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt b/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
deleted file mode 100644
index 5a6b73a..0000000
--- a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.lukas.music
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bf99e36..4be99ea 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application' version '7.2.1' apply false
     id 'com.android.library' version '7.2.1' apply false
diff --git a/gradle.properties b/gradle.properties
index 0dee8cb..eea5a90 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,12 @@
+#
+# Copyright (C) 2022 Lukas Eisenhauer
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 android.useAndroidX=true
 kotlin.code.style=official
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 9a617b0..75f0e09 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,4 +1,12 @@
-#Thu Jul 28 17:39:29 CEST 2022
+#
+# Copyright (C) 2022 Lukas Eisenhauer
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 distributionBase=GRADLE_USER_HOME
 distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 distributionPath=wrapper/dists

diff --git a/.idea/copyright/GPLv3.xml b/.idea/copyright/GPLv3.xml
new file mode 100644
index 0000000..5cdb4b7
--- /dev/null
+++ b/.idea/copyright/GPLv3.xml
@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="Copyright (C) &amp;#36;today.year Lukas Eisenhauer&#10;&#10;This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License along with this program.  If not, see &lt;https://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="GPLv3" />
+  </copyright>
+</component>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 5c9d3cd..97f8bf5 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,6 +4,8 @@
     <option name="filePathToZoomLevelMap">
       <map>
         <entry key="../../../../layout/custom_preview.xml" value="0.11690647482014388" />
+        <entry key="app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.195" />
+        <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.195" />
         <entry key="app/src/main/res/layout/activity_main.xml" value="0.25" />
         <entry key="app/src/main/res/layout/credits.xml" value="0.1" />
         <entry key="app/src/main/res/layout/credits_layout.xml" value="0.21354166666666666" />
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e72bfdd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 914b12b..35173c4 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
diff --git a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt b/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
deleted file mode 100644
index 485827a..0000000
--- a/app/src/androidTest/java/com/lukas/music/ExampleInstrumentedTest.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package com.lukas.music
-
-import androidx.test.platform.app.InstrumentationRegistry
-import androidx.test.ext.junit.runners.AndroidJUnit4
-
-import org.junit.Test
-import org.junit.runner.RunWith
-
-import org.junit.Assert.*
-
-/**
- * Instrumented test, which will execute on an Android device.
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-@RunWith(AndroidJUnit4::class)
-class ExampleInstrumentedTest {
-    @Test
-    fun useAppContext() {
-        // Context of the app under test.
-        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
-        assertEquals("com.lukas.music", appContext.packageName)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 9a60ba0..38dfb37 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.lukas.music">
diff --git a/app/src/main/java/com/lukas/music/MainActivity.kt b/app/src/main/java/com/lukas/music/MainActivity.kt
index 22042e9..3913bab 100644
--- a/app/src/main/java/com/lukas/music/MainActivity.kt
+++ b/app/src/main/java/com/lukas/music/MainActivity.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/instruments/Instrument.kt b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
index f96edaa..8ad90c6 100644
--- a/app/src/main/java/com/lukas/music/instruments/Instrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Instrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.databinding.FragmentInstrumentBinding
diff --git a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
index 228e053..dc64bcc 100644
--- a/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/InternalInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 class InternalInstrument {
diff --git a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
index 100c0f9..e7b7464 100644
--- a/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/MonoInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
index fd6bfc2..9d8b4f9 100644
--- a/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
+++ b/app/src/main/java/com/lukas/music/instruments/PolyInstrument.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
index 4b47c80..75c1545 100644
--- a/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Rhythm.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 import com.lukas.music.song.Song
diff --git a/app/src/main/java/com/lukas/music/instruments/Waveform.kt b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
index a7d5dd1..3a3de19 100644
--- a/app/src/main/java/com/lukas/music/instruments/Waveform.kt
+++ b/app/src/main/java/com/lukas/music/instruments/Waveform.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.instruments
 
 enum class Waveform(val id: Int, private val identifier: String) {
diff --git a/app/src/main/java/com/lukas/music/song/Scale.kt b/app/src/main/java/com/lukas/music/song/Scale.kt
index bc016cb..8e08034 100644
--- a/app/src/main/java/com/lukas/music/song/Scale.kt
+++ b/app/src/main/java/com/lukas/music/song/Scale.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.song.chords.ChordType
diff --git a/app/src/main/java/com/lukas/music/song/Song.kt b/app/src/main/java/com/lukas/music/song/Song.kt
index e666dca..a3123f2 100644
--- a/app/src/main/java/com/lukas/music/song/Song.kt
+++ b/app/src/main/java/com/lukas/music/song/Song.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/chords/Chord.kt b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
index e0dd8fc..db45fdd 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Chord.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Chord.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.song.note.Note
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
index f1a5bb2..ec455f3 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordProgression.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.MetaCycle
diff --git a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
index 95b69a0..1fe4b40 100644
--- a/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/ChordType.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 enum class ChordType(
diff --git a/app/src/main/java/com/lukas/music/song/chords/Interval.kt b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
index 60a6ced..2726787 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Interval.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Interval.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 class Interval(private val distance: Int) {
diff --git a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
index 384254f..1cadb06 100644
--- a/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
+++ b/app/src/main/java/com/lukas/music/song/chords/Phrase.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.chords
 
 import com.lukas.music.util.Cycle
diff --git a/app/src/main/java/com/lukas/music/song/note/Note.kt b/app/src/main/java/com/lukas/music/song/note/Note.kt
index dbeb453..d3a588d 100644
--- a/app/src/main/java/com/lukas/music/song/note/Note.kt
+++ b/app/src/main/java/com/lukas/music/song/note/Note.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/note/NoteName.kt b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
index 1137a42..5345ad5 100644
--- a/app/src/main/java/com/lukas/music/song/note/NoteName.kt
+++ b/app/src/main/java/com/lukas/music/song/note/NoteName.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.note
 
 import kotlin.math.pow
diff --git a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
index b67965d..3990554 100644
--- a/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/BassVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
index d173023..fc5362d 100644
--- a/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/ChordVoice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/song/voice/Voice.kt b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
index 8347c73..f7fca94 100644
--- a/app/src/main/java/com/lukas/music/song/voice/Voice.kt
+++ b/app/src/main/java/com/lukas/music/song/voice/Voice.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.song.voice
 
 import com.lukas.music.instruments.Instrument
diff --git a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
index 6f36573..8961831 100644
--- a/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/adapters/InstrumentAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.adapters
 
 import android.view.LayoutInflater
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
index 290284c..410226d 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/CreditsFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
index 2f3bbb2..a311a6c 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/EditChordFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.R
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
index 6b77049..3f1a910 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/InstrumentListFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
index fe25848..eaf2c61 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/PlayFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
index c9daa9e..62d314f 100644
--- a/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
+++ b/app/src/main/java/com/lukas/music/ui/fragments/SongFragment.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.fragments
 
 import android.os.Bundle
diff --git a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
index 6fdf160..900ea3c 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/PageListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class PageListener(private val tabLayout: TabLayout): ViewPager2.OnPageChangeCallback() {
+class PageListener(private val tabLayout: TabLayout) : ViewPager2.OnPageChangeCallback() {
     override fun onPageSelected(position: Int) {
         super.onPageSelected(position)
         tabLayout.selectTab(tabLayout.getTabAt(position))
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
index 4bd5064..2bbf563 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabAdapter.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.fragment.app.Fragment
diff --git a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
index 176157d..7f3c36f 100644
--- a/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
+++ b/app/src/main/java/com/lukas/music/ui/tab/TabListener.kt
@@ -1,9 +1,19 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.ui.tab
 
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.tabs.TabLayout
 
-class TabListener(private val pager: ViewPager2): TabLayout.OnTabSelectedListener {
+class TabListener(private val pager: ViewPager2) : TabLayout.OnTabSelectedListener {
     override fun onTabSelected(tab: TabLayout.Tab?) {
         tab?.let { pager.currentItem = it.position }
     }
diff --git a/app/src/main/java/com/lukas/music/util/Cycle.kt b/app/src/main/java/com/lukas/music/util/Cycle.kt
index 7e49239..45a2e0f 100644
--- a/app/src/main/java/com/lukas/music/util/Cycle.kt
+++ b/app/src/main/java/com/lukas/music/util/Cycle.kt
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 package com.lukas.music.util
 
 open class Cycle<T>(initialSize: Int = 0) : ArrayList<T>(initialSize) {
diff --git a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
index 2b068d1..a77b881 100644
--- a/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:aapt="http://schemas.android.com/aapt"
     android:width="108dp"
diff --git a/app/src/main/res/drawable/ic_launcher_background.xml b/app/src/main/res/drawable/ic_launcher_background.xml
index 07d5da9..c98f052 100644
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
     android:width="108dp"
     android:height="108dp"
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 3eaf701..0f15e00 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_credits.xml b/app/src/main/res/layout/fragment_credits.xml
index ffb1f59..e07d6a0 100644
--- a/app/src/main/res/layout/fragment_credits.xml
+++ b/app/src/main/res/layout/fragment_credits.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/fragment_edit_chord.xml b/app/src/main/res/layout/fragment_edit_chord.xml
index 8de2950..16fa8f2 100644
--- a/app/src/main/res/layout/fragment_edit_chord.xml
+++ b/app/src/main/res/layout/fragment_edit_chord.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument.xml b/app/src/main/res/layout/fragment_instrument.xml
index c08b868..5377212 100644
--- a/app/src/main/res/layout/fragment_instrument.xml
+++ b/app/src/main/res/layout/fragment_instrument.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_instrument_list.xml b/app/src/main/res/layout/fragment_instrument_list.xml
index bc04751..2b1bda3 100644
--- a/app/src/main/res/layout/fragment_instrument_list.xml
+++ b/app/src/main/res/layout/fragment_instrument_list.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_play.xml b/app/src/main/res/layout/fragment_play.xml
index e4182bf..4e84c03 100644
--- a/app/src/main/res/layout/fragment_play.xml
+++ b/app/src/main/res/layout/fragment_play.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/layout/fragment_song.xml b/app/src/main/res/layout/fragment_song.xml
index a54563f..9a19d89 100644
--- a/app/src/main/res/layout/fragment_song.xml
+++ b/app/src/main/res/layout/fragment_song.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
index eca70cf..474c33a 100644
--- a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@drawable/ic_launcher_background" />
     <foreground android:drawable="@drawable/ic_launcher_foreground" />
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
index da06d7a..359c157 100644
--- a/app/src/main/res/values-night/styles.xml
+++ b/app/src/main/res/values-night/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
index c86fbdd..daee520 100644
--- a/app/src/main/res/values-night/themes.xml
+++ b/app/src/main/res/values-night/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/values/attrs_instrument_view.xml b/app/src/main/res/values/attrs_instrument_view.xml
index 8138515..de2c486 100644
--- a/app/src/main/res/values/attrs_instrument_view.xml
+++ b/app/src/main/res/values/attrs_instrument_view.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <declare-styleable name="InstrumentView">
         <attr name="exampleString" format="string" />
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index e691a4f..0c9082f 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -1,4 +1,13 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <color name="purple_200">#FFBB86FC</color>
     <color name="purple_500">#FF6200EE</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index c125463..55730a8 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
     <string name="app_name">Music</string>
     <string name="play_tab">Play</string>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index d142c10..9fe8efb 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources>
 
     <style name="Widget.Theme.Music.MyView" parent="">
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
index 9e986a1..861b79e 100644
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@@ -1,3 +1,13 @@
+<!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <resources xmlns:tools="http://schemas.android.com/tools">
     <!-- Base application theme. -->
     <style name="Theme.Music" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
diff --git a/app/src/main/res/xml/backup_rules.xml b/app/src/main/res/xml/backup_rules.xml
index fa0f996..01550fe 100644
--- a/app/src/main/res/xml/backup_rules.xml
+++ b/app/src/main/res/xml/backup_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample backup rules file; uncomment and customize as necessary.
    See https://developer.android.com/guide/topics/data/autobackup
    for details.
diff --git a/app/src/main/res/xml/data_extraction_rules.xml b/app/src/main/res/xml/data_extraction_rules.xml
index 9ee9997..ea105f2 100644
--- a/app/src/main/res/xml/data_extraction_rules.xml
+++ b/app/src/main/res/xml/data_extraction_rules.xml
@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2022 Lukas Eisenhauer
+  ~
+  ~ This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+  ~
+  ~ This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+  ~
+  ~ You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<!--
    Sample data extraction rules file; uncomment and customize as necessary.
    See https://developer.android.com/about/versions/12/backup-restore#xml-changes
    for details.
diff --git a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt b/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
deleted file mode 100644
index 5a6b73a..0000000
--- a/app/src/test/java/com/lukas/music/ExampleUnitTest.kt
+++ /dev/null
@@ -1,17 +0,0 @@
-package com.lukas.music
-
-import org.junit.Test
-
-import org.junit.Assert.*
-
-/**
- * Example local unit test, which will execute on the development machine (host).
- *
- * See [testing documentation](http://d.android.com/tools/testing).
- */
-class ExampleUnitTest {
-    @Test
-    fun addition_isCorrect() {
-        assertEquals(4, 2 + 2)
-    }
-}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index bf99e36..4be99ea 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 plugins {
     id 'com.android.application' version '7.2.1' apply false
     id 'com.android.library' version '7.2.1' apply false
diff --git a/gradle.properties b/gradle.properties
index 0dee8cb..eea5a90 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,12 @@
+#
+# Copyright (C) 2022 Lukas Eisenhauer
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
 android.useAndroidX=true
 kotlin.code.style=official
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 9a617b0..75f0e09 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,4 +1,12 @@
-#Thu Jul 28 17:39:29 CEST 2022
+#
+# Copyright (C) 2022 Lukas Eisenhauer
+#
+# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
 distributionBase=GRADLE_USER_HOME
 distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
 distributionPath=wrapper/dists
diff --git a/settings.gradle b/settings.gradle
index 12d0f8b..05de31e 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,3 +1,13 @@
+/*
+ * Copyright (C) 2022 Lukas Eisenhauer
+ *
+ * This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or(at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 pluginManagement {
     repositories {
         gradlePluginPortal()