A couple of years ago I created a Spotify’s playlist where I add all tracks I liked, just as the main repository of things I’d like to listen to, no matter the mood I was when I added that song. As time goes, this playlist became less enjoyable to listen due to the change in rhythm - From listen to a Metal song it jumps to Bossa Nova, which is very annoying. This post contains a few data science approaches I applied to organize this playlist and what worked and what didn’t.