Which psychological principle do music streaming services primarily use when they create personalized 'Discover Weekly' playlists based on your listening history?

The music industry has been revolutionized by streaming services that carefully design their user experiences to maximize engagement and listening time. Behind these platforms are sophisticated psychological principles that influence how we discover, consume, and share music. This trivia question explores how streaming platforms leverage consumer psychology to shape our listening habits and preferences.

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The Mere Exposure Effect - increasing preference for songs similar to what you've already heard
The Zeigarnik Effect - creating playlists with unfinished musical themes to keep listeners engaged
The Bandwagon Effect - showing you only what's popular among other listeners
The Decoy Effect - including songs you won't like to make their recommendations seem better by comparison