MusicBrainz is an open source database of music. ListenBrainz is an open source service that captures your listening habits, if you’ve configured your music player (or Spotify) to use the service. It’s similar in nature to last.fm’s scrobbling.

ListenBrainz has a feature where once a week it will build a pair of playlists for you. One is stuff it is pretty sure you will like (based off of what tracks you have favorited) and the other is more… experimental. Stuff it’s not so sure you’ll like but is similar to things you have listened to and liked in the past.