There's a great new article about Pandora in Sunday's New York Times.
If Pandora and other customizable services take off (and so far that’s a big if), they could shift the balance of power not just in how music is consumed, but in how it is made. “You now have music fans that are completely enabled as editorial voices,” said Michael Nash, senior vice president for digital strategy and business development at Warner Music Group, one of the four major music conglomerates. “You can’t fool those people. You can’t put out an album with one good single on it. Those days are over.”