The information I am about to share may cause you to become an addict. You may spend hours fiddling with the controls, creating new stations and proselytizing to non-users. You may alienate your family and friends with your newfound passion.
You have been warned.
"Pandora's personalized radio service is powered by the Music Genome Project, the most comprehensive analysis of music ever undertaken. Pandora taps into a massive musical collection to deliver a service available anytime and anywhere - on the computer, in the home, and on mobile devices. Members of the Pandora community build their own profiles, and connect to others to share in their musical experience. Pandora has quickly become one of the largest online radio services, well-funded and with over 10 million registered users and growing fast."