If not, I highly recommend it. You type in the name of a group or singer and then it creates your own live stream of that artist and similar artists. Best thing is its free!! You can also download an app for the iPod Touch or iPhone. Currently listening to The Jam channel.
Really liked it before it was blocked Used to use it a lot. I occasionally use Last FM now but don't get on with it to the same extent. The ability to set up your own stations based on multiple bands/songs is something I don't think you can do with Last FM but which was great on Pandora.