The Echo Nest was really cool... they got bought my Spotify and some of the Echo Nest APIs made it into Spotify I believe: https://developer.spotify.com/documen

The Echo Nest was really cool... they got bought my Spotify and some of the Echo Nest APIs made it into Spotify I believe: https://developer.spotify.com/documentation/web-api/reference/get-audio-analysis https://developer.spotify.com/documentation/web-api/referenc...