Attached Link: http://www.archive.org/details/audio

Archive.org has a fairly huge audio section. Much of it is released under Creative Commons. However, the catch is that finding the gems amongst the randomness and crap is an enterprise in itself. But there are good songs and music in general to be found there, it just takes time.

If you just need some filler, you could also try making it yourself. These may be handy for starting out:
http://www.anvilstudio.com/
http://www.rebirthmuseum.com/
http://www.audacity.org/
http://eng.musicshake.com/

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.