It's a custom mixtape of 30 songs they've never listened to before but will probably love. It's called Discover Weekly, and it's pretty much magic. It makes me feel seen. It knows my musical tastes better than any person in my life ever has, and I am consistently delighted by how it satisfies me just right every week, with tracks I myself would never have found or known I would like. As it turns out, I'm not alone in my obsession with Discover Weekly--the user base went crazy for it, which has driven Spotify to completely rethink its focus, investing more resources into algorithm-based playlists.