What is Creative Commons?
Creative Commons is a system that allows you to legally use “some rights reserved” music, movies, images, and other content — all for free. CC offers free copyright licenses that anyone can use to mark their creative work with the freedoms they want it to carry. For instance, a musician might use a Creative Commons license to allow people to legally share her songs online, make copies for friends, or even use them in videos or make remixes.
Can I use any song with a CC license on it?
Almost — you need to make sure that what you want to do with the music is OK under the terms of the particular Creative Commons license it’s under.
Also, make sure to properly credit the musician and the track, as well as express the CC license the track is under.