Free music can also mean free improvisation: improvised music without any rules, and not in any particular style.
Free music, like free software, is music that can freely be copied, distributed and modified for any purpose. It does not mean that there should be no fee involved. The word free refers to freedom, not to price.

Some free music is licensed under licenses that are intended for software (like the GPL) or other written media (the GFDL). But there are also licenses especially for music and other works of art, such as EFF's Open Audio License, the Ethymonics free music license ([1]), Linuxtag's OpenMusic License ([1]), the Free Art license and the Creative Commons Licences.

See also: copyleft

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