Pandora and the Music Genome Project
Some years back the Music Genome Project was started in an attempt to classify as many songs as possible; Pandora is the culmination of that effort. One simply tells it a few musicians or songs one likes, and it uses fairly significant human analysis of the songs in its database (over 300,000, I believe) to predict some more in the same style which you might like. Pretty cool—cool enough to get me to spring $36 for a year’s membership.

