Slacker Radio

Unknown Stream Rate
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Another of the web sites that creates custom radio stations based on your favorite artists. This one assigns similar artists to each of the artists they have in their database. When you choose an artist or artists as the basis for a station, you get the option of adding any or all of the related artists to the station's playlist. The site appears to have a wide variety of artists and songs, so you can create pretty much any kind of station you like.
Note: There's some classical here, but mainly it's more contemporary stuff.

"Slacker is a new kind of music company. We deliver personal radio that is customized for every listener. Slacker is effortless to use and the music is accessible at home, in the car, or on the go."