“Although the guidelines for using copyrighted music in the classroom (and literally, I mean “in the classroom”) make it relatively easy and permissible to use most kinds of music, there is often a need to ‘publish’ your video or other media work with royalty-free music. Examples may be: music to integrate with your school news programs, DVD’s to distribute or sell, or publishing videos or podcasts to websites that don’t police copyrighted material, etc. (like YouTube does)
Purple Planet Royalty Free Music: Free to use, even for commercial use but they require a link- easy enough.
Freeplay Music: Vastly better library but has a lot more “TOU” info to wade through. Does not require a contract in strictly educational settings and/or for personal use.
Free Music Archive: Most music at freemusicarchive.org is licensed as “public domain”, everything else is licensed for non-commercial use. The site is run by freefrorm radio station WFMU