Carl Bialik from the WSJ writes "The company Pandora Media takes a different tack for its online music-recommendation service. When you tell Pandora a song you like or have bought, it doesn't mine its sales database for records of other purchases by those who have bought the song. Instead, it looks for songs with a similar musical profile, based on a database of 300,000 songs rated on up to 400 characteristics like rhythmic syncopation, vamping and vocal harmonies. To analyze the songs, Pandora has hired Bay Area musicians like San Francisco jazz guitarist Bob Coons. 'When Mr. Coons describes a particular song, he uses phrases like the "complexity of the chromaticism" and "richness of the harmonic structure." He has studied the chord structure in Britney Spears' "Oops I Did It Again," and reports that it is "actually fairly complex," ' the Wall Street Journal Online reports."

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