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Shazam does similar things? If you download Shazam onto your phone and hear a song (wherever - in the supermarket, a club, etc) you like, but don't know what it is, Shazam finds it for you (based on a soundclip it takes from your phone's mic at the time) and can make recommendations based on it. Pretty handy app, though I don't know if it's available in its full format in SA yet...
