This is really cool -- I know I tend to enjoy certain songs that share certain characteristic flows, this would be a fun way to sort of "quantify" and organize

This is really cool -- I know I tend to enjoy certain songs that share certain characteristic flows, this would be a fun way to sort of "quantify" and organize a music library. I wonder if Spotify uses a technique like this as a heuristic for their song suggestions. Is there an open source alternative for Melodyne?