Royalty Free Music

Just found and excellent resource: 30 Creative Commons Sources

http://blogs.sitepoint.com/30-creative-commons-sources/

www.SmartSound.com has a cool set of features for adding high-impact royalty free music to your project. They are the only ones with this patented process that makes the music the exact length that you want. Most of the music also comes with each instrument on a separate track so you can arrange the sound to fit your project. It works great, and saves a bunch of time.

I found this link looking for free music...

Brainy Betty...

http://www.brainybetty.com/soundsforpowerpoint.htm

FreePlay Music is one of my favorites:

http://freeplaymusic.com/

DigitalJuice.com has really good stuff called StackTraxx. They don't advertise them anymore, but if you call them they have them. Layered music so that one song can be used in a bunch of different ways. And usually pretty cheap, too.

Steve, thanks for posting that site! I have used Kevin MacLeod's music on a few projects (he is the artist who shares his stuff via that site). I think it's so cool that he is willing to share his work so freely, even for commercial use.

Another source for audio is soundsnap.com.  Although the downloads cost a little bit, the prices are pretty reasonable (especially if you by a larger package) and they're royalty-free.

I've snagged some movie and audio clips from the public domain archives.

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

Stock Music Boutique has some very cool tracks too http://goo.gl/SvYkd

Here's another site for Royalty Free Music:

http://www.partnersinrhyme.com/

You can also get individual songs at:

http://www.musicloops.com/

I've used ccMixter for some short tracks. I even downloaded a couple of songs for my own listening pleasure.

http://ccmixter.org/