So, I've only just got into this thanks to a mate.
http://www.pandora.com/
It's a musical genome thing, it picks songs based on what you tell it you like. Unlike most of these I've tried, it's right more than it's wrong.
It's come up with some blinders so far, although it lacks in Classical and 'world' music by its own admission.
I'm confused as to why the entireity of its selections for the songs it plays are based on my (apparent) love of 'extensive vamping'.
Sorry if someone's posted this already. Actually, Fuck you. Your opinion isn't important.