Sent a link to this site earlier - http://www.pandora.com - enter your favorite band of the moment and it selects a playlist based on the type of music they play, the chords and riffs rather than some user-selected random description. First 5 tracks are free to listen to, then you have to register to continue. Registration is free but ad-supported. Each track played has a link to iTunes and Amazon to buy it if you want to buy and download it.
