Last.fm is a music tracking service that records what you listen to — a process called scrobbling — and builds a profile of your taste over time. It connects to Spotify, Apple Music, YouTube, and other players, so your listening history accumulates automatically. You can see what you've played most, discover similar artists, and find "neighbors" who have similar taste. The recommendation engine is based on actual listening data from millions of users, not editorial curation.

The site has been running since 2002 and has a dedicated community of music data enthusiasts. The statistics and charts it generates are genuinely interesting if you like seeing your listening habits in numbers. It's free to use and works alongside whatever streaming service you already have.