music.COPYING.txt

Creative Commons Attribution-ShareAlike 3.0 Unported License

You are free:
  to Share (to copy, distribute and transmit the work) and
  to Remix (to adapt the work) under the following conditions:

  Attribution — You must attribute the work in the manner specified by the
  author or licensor (but not in any way that suggests that they endorse you
  or your use of the work).

  Share Alike — If you alter, transform, or build upon this work, you may
  distribute the resulting work only under the same, similar or a compatible
  license.

For more information, see http://creativecommons.org/licenses/by-sa/3.0/