I found this website with a great list of websites that have music, sounds, loops, effects, etc under different licenses, such as Creative Commons, Open Source, Public Domain, etc, but free. Check it out, there might be something for you:
http://www.artistx.org/site2/media/free-re...free-music.htmlAlso the site itself
http://www.artistx.org is about a linux distro for music creation and other creative talents... very cool!
(I am in no way affiliated with the previous site, but I really liked their concept so I am sharing here. If this is against the rules please edit and let me know please.)