Rate music for me (Score 1)

I'd like to see a system that rates music by "listening" to it and determining basic things like melodic content, key, bpm, etc. in addition to the usual artist, genre and so on, and starts recommending music for me based on my past choices. It's really getting to be old hat to have music recommended based on what other people liked and how they rated it. I want to see a more impartial, objective method that works... maybe even better.