iTunes is nice. The licencing is pretty broad, and payment is very easy once you set up an account. You can also beat the licencing, I'm sure, by burning a CD of a licenced song and then ripping it. As a matter of fact, I think I'll go try it now.

-Philip Maynard '95 Contour [71 STS | Track Whore] '97 Miata [71 ES | Boulevard Pimp] 2006 autocross results