Listeners took to it, according to Spotify's analytics that track how often people play a song, how much of that song they listen too, whether they add it to their own playlists, and more. Two months after its release, a Spotify editor added it to the Danish version of the New Music Friday playlist. Still, the song didn't explode overnight. In the process, they've changed the way artists and songs break. Spotify, Apple Music, and others have changed the people listen to music. He declined to prove it, but says his team certainly saw 'Call on Me' coming. Nick Holmsten, the service's head of shows and editorial, claims he could dig into the data and tell you which new song will be a hit in six months. Just as Facebook loves rolling out new features to a tiny subset of its users, killing what doesn't work and expanding on what does, Spotify considers every track a beta test. Think of it as the moneyball of music, a ruthlessly data-driven approach to introducing listeners to songs. These playlists, created by individual users or Spotify 'editors,' form the curated labyrinth through which Spotify can lead an artist or song from obscurity to mass appeal. The song owes much of its success to Spotify playlists. Although you hear it all over the radio now, Spotify users found themselves bouncing along to her synthy strains seven months ago. Hope wrote a certified hit single, one dwarfed only by the remix from Aussie DJ Ryan Riback.

It hit number one on the Swedish charts, and went gold or platinum in nine countries. She released the track as her debut single in July, expecting it to be her swan song.

'I decided I was going to give it up and get a 'real job,'' she told the website Music Love. Starley Hope thought she was done with the music biz after writing 'Call on Me.' The song felt like her last shot at success after spending years trying to make it as a songwriter.

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