Rootclip

If you looking for royalty free music that you can use in your Rootclip submissions then this should be helpful.

Found this post on Revver that has links to a bunch of royalty free music.

Here is their list:
partnersinrhyme.com
brainybetty.com
incompetech.com
jamendo.com
openmusicarchive.org
opsound.org
ccmixter.org
thefreesoundproject
eStockmusic.com

Also, they mention that "if you use GarageBand, FruityLoops or LogicExpress software, all three applications come with royalty-free pre-recorded instrumentals in loops."