Since there are so many threads about music on this forum, I thought it made sense, to post links to some music(audio books too). One thing to keep in mind, THE FILES MUST BE PUBLIC DOMAIN!
I'll start.
MP34U(main site) (http://www.mp34u.com/index.php)
Plenty of good old music.
Despite the fact, that I don't know who most of the musicians are(similar to most new bands XD ), I think it's more than worth a listen.I should also mention, that some/many are of low quality.
Celtic Music Scores (http://breizhpartitions.free.fr/en/)
MIDIs, MP3s, sheet music, etc.
CPDL (http://www.cpdl.org/)
This is a link to some free sheet music(Public Domain).
I have some more links to post, but I'll save them for later.
P.S. The first link, I accidently linked to the wrong part of the site. It's fixed now.