Here's some code that strips down a song to its Shazam-able fingerprint:

https://github.com/jvbalen/soundofshazam/blob/master/sound_o...

And an example output (try Shazam-ing it!):

https://soundcloud.com/sample_noise/shazuffle-ii-shazam-me

And here's a Java project with similar functionality (although I'm not sure it will have near the same accuracy). [0]

He also got some legal threats just for publishing code he created himself.

[0] http://royvanrijn.com/blog/2010/06/creating-shazam-in-java/

Absolutely fascinating, it covers so much breadth too!