I really like Pandora as a Music Discovery Tool, the more you teach it, the more it dials in on your musical tastes, you have to get though the WTF why did it play that to me moments, and it will eventually deliver a lot of good music you have never heard. Publishers use it to find new bands, I can say that, as they have contacted me, after hearing a band on Pandora..
I have been teaching Pandora over the last couple of years, slowly dialing in the station.