Where is a good place to download some license-free music, for free?

I have a casual animation project I’d like to set some music to, but I don’t have the talent to write my own, and since it’s not anything major I’d rather not spend money I don’t have to. Usually I’d just grab any old song for a hobby project, but if this one goes good, I may show it to someone who could possibly be interested in putting on the air.