Yep, free Internet radio...You create "stations" by entering a favorite artist or song...It searches its huge database and finds similar artists and/or songs, and tells you why it selected them. Very, very cool...Right now I'm listening to a kicka$$ station based on Buddy Guy's "Damn Right I've Got The Blues" song...Highly recommended for music freaks like me; you'll discover a LOT of new artists.
Go here http://www.pandora.com and enjoy!