I just followed that link, which led to a page containing another "previous discussion" link, and then a couple more, and ended back on a slashdot article from Monday August 28, 2000!!

Shazam has always been a pretty amazing product, especially when you consider that it was first released nearly 20 years ago. It has also been fairly poorly understood, so I am glad that people are taking the time to revisit and review the technology behind it.