Add music2 LICENSE

diff --git a/music2_LICENSE b/music2_LICENSE
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+++ b/music2_LICENSE
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+This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.