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I use a free iPhone app called Shazam which helps you find a song that is playing through any audio output.

The company offer many ways to get Shazam, you can get it on iPhone, iPod touch, Blackberry, Android, FaceBook, or any mobile phone (only available in the UK).

Now if you want to know how Shazam does its magic, then you should go through this PDF research that explains the technology behind it.