Spotify uses peoples manual playlists to drive some recommendations. If two songs are on a playlist together they’re probably similar. In the same way, if a so

Spotify uses peoples manual playlists to drive some recommendations. If two songs are on a playlist together they’re probably similar. In the same way, if a song isn’t on any playlists, like you’d expect a skit not to be, then they don’t recommend it. Free human curation of stuff that goes well on playlists.