By Farhad Manjoo at Slate
http://www.slate.com/articles/technology/technology/2009/10/that_tune_named.html
“An Industrial-Strength Audio Search Algorithm”
By Avery Wang, Shazam co-founder
http://www.ee.columbia.edu/~dpwe/papers/Wang03-shazam.pdf
“How does Shazam work to recognize a song?”
By Nicolae Surdu
http://www.soyoucode.com/2011/how-does-shazam-recognize-song