If it is really important to you and you can spare 50p, then use Shazam!
Dial 2580 from your mobile and hold your phone near a speaker while playing the song.
You need to play at least a 20-30s clip. Within a minute or so, it'll text you back the artist and track name at a cost of 50p (about 50p is what I remember anyway).
we've used it a few times and I've never seen it fail, even with really obscure songs! Comes in really handy in this sort of situation if you are really desperate to know the song and can't figure it out any other way!
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