searching for meaning without a map

This one is gonna be short, but I intended to post again later.
Anyways, a friend told me about pandora.com. You type in an artist or song and they find a station with that kind of music.
I am addicted.
I've been looking for some more music, and this has people you wouldn't think of.
But I'm still looking for some music.
I don't like country, rap from after the mid ninties, and metal, other than that I'm open.
Any suggestions?