Pandora does something similar. They only have "like" and "dislike" rating. If you like a song they look at other users who liked that song and try to find more

Pandora does something similar. They only have "like" and "dislike" rating. If you like a song they look at other users who liked that song and try to find more songs/bands from the people with your taste. And the other way around for dislike i guess. It works exceptionally well. You just listen to the stream of incoming songs, you never pick songs yourself. After a good song you click like, after a mediocre song you keep listening, during a bad song you click skip. After a few days you will only get good songs! (with a few exceptions of course) It's like magic, i can't even count how many new bands i found through pandora without any effort. Too bad it doesn't work outside US anymore. :(