Free Legal Music Downloads

Check out Spiral Frog.
The catch: you are subjected to some advertising while the music is downloading. I see no problem with that; I'll just walk away from the computer for a bit. I plan on testing it out tonight.

Update:
Spiral Frog is for PCs only. If you have a Mac, like I do, your out of luck. So, if someone with a PC wants to give it a try and report back, please do. I'll test it out on Monday from work...shhh, don't tell.