For a good discussion of various royalty free licensees and a list of good free sources of music see
this disucssion at the HV20 forum.
The discussion focuses on the creative commons license and provides links to websites with very complete collections.
Your can also check out
Freeplaymusic.com for background music. These are original compositions that can be used free in for non-commercial uses. If you make money, then you need to work out a royalty The Creative Commons list is much larger.
Good luck.
Les
