So that's how it works!

Shazam! is a really rather cunning system; dial 2580 on your mobile phone, hold it up to a loudspeaker, and a few seconds later it'll text you the name of the track being played. Remarkably, it works; here are brief notes on how.

Sadly, I've only used it about twice in the last year. Bloody clever, but I'm not sure how much use it is.