Some interesting technology behind the online music biz

Gracenote has quietly become one of the most powerful companies in digital music -- but many of its users have probably never heard of it. Its music-identification technology powers media players like AOL and the ever-popular iPod. For recording labels, Gracenote's technology is a key part of making the digital music business hassle-free and fan-friendly.

"The House That Music Fans Built" from Wired News.