This site plays the music you want, and the music you will probably like but didn't know you wanted. Type in an artist's name and you'll find yourself instantly listening to full tracks from that artist (not clips), but you'll also be provided with playlists created automatically or by other users with artists similar to the one you entered in. You can help improve the site's "recommendation engine" by creating your own playlists or tagging music. Oh, and did I mention this service was free?