I don't know where I have been ... just learned about the Music Genome Project, started in 2000 and now implemented on a site called Pandora. I learned about it because they recently created an application for the IPhone. Well implemented for a mobile device. Good for people that like to listen to wide ranges of music and be introduced to other music.
And from the technical side, the idea seeks to :" ... capture the essence of music at the fundamental level using over 400 attributes to describe songs and a complex mathematical algorithm to organize them ..." . What is not to like about that? :) A good case study for other practical classification problems. The actual 'closeness' analysis looks easy, the tagging of the music harder and costly.
Free now, supported by an ad model ... you can buy what you are hearing on Itunes. But there are dark clouds on the horizon, increased fees for serving up the music may require the service to be shut down or severely change their economic model. It has already been stopped outside the US.
See also the similar internet radio station Last FM.
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