Spotify uses machine learning and algorithms to analyze music, and the way they are doing it is fascinating, maybe not what you're asking but this is an interesting read anyway:
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Spotify uses machine learning and algorithms to analyze music, and the way they are doing it is fascinating, maybe not what you're asking but this is an interesting read anyway:
medium.com/s/story/spotifys-discov...
You are right, not what I am looking for.