TubeNet

http://www.midomi.com/

I have a suspicion that it's not going to do very well with some of the greatest hits of the Second Viennese School.

Hey that site is fun, thanks. It reminded me (for some reason) of the time Sting was on SNL, and I think in one skit everyone was trying to sing Roxanne to him, so I tried it here, it wouldn"t recognize the tune in the high voice, but got it when I sang it about 2 octaves lower.

Try it, try singing Roxanne and see if it recognizes the song.