Shazam is one of the few sites which makes my jaw drop. We've got used to instant responses to searches on Google but somehow, the ability to recognise any one of 3.2 million tracks from a noisy 20 second sample seems amazing. This is what Shazam does: when you hear a track you don't recognise, dial 2580 on your mobile; when Shazam answers, direct your phone to the sound source; Shazam hangs up after 20 seconds and about 30 seconds later it will text you back with the name of the Album and track [and take 50p from your account!]
Here are a couple of tracks to play to it if you can't think of your own:
and some links to papers and presentations on the technology behind Shazam:
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