Spotify's Discover Weekly playlists have 40 million listeners

The feature has also ended up being a decent hook for keeping listeners engaged. Spotify says over half of Discover Weekly users come back the following week, and a similar amount saves at least one song to their own libraries. I suppose that shouldn't be too surprising though -- having millions of tracks to stream is both a blessing and a curse. So something like Discover Weekly, which knows your habits and can apply it to Spotify's entire library with machine intelligence, can be a huge help for finding music you'd actually like. Spotify says the feature has also helped smaller artists get discovered.