Most Internet radio sites tailor the music to your tastes. Often all you have to do is enter the name of an artist you like and the site will create a music stream with you in mind.
Pandora - Expert Selections: One of the most interesting Internet radio sites is Pandora. At Pandora, trained music experts categorize each song using up to 400 different attributes. When you tell the site the name of an artist it picks songs that match attributes of songs by that artist.
Slacker - High-Quality Sound: Slacker sets itself apart by offer "CD-quality" sound - better than most of the other free services.
Last.fm - Tailored to Your Tatstes: Last.fm compares your favorites and playlists to those of others to determine songs you will enjoy. Last.fm supports more music players (both software and hardware) than most of the other services.