Jason Fry writes in WSJ about a music-streaming service:
Pandora’s team of music analysts take songs apart, assigning values to as many as 400 musical nuances per song; the service then uses that information to compare songs and make recommendations. This effort — Pandora calls it the Music Genome Project — has won the company lots of ink and plaudits from music geeks like me, who love asking Pandora why it played that Franz Ferdinand song and reading “because it features electric rock instrumentation, a subtle use of vocal harmony, a vocal-centric aesthetic, major key tonality and electric rhythm guitars.”
But another strength of Pandora’s is more straightforward: Tuning its recommendation engine is fun, so it gets lots of feedback from users. After all, music geeks love enumerating their likes and dislikes with pinpoint accuracy and passing judgment on bands.