Which feature did Spotify introduce in 2015 that revolutionized music discovery using advanced retail analytics and significantly reduced listener churn?

The music industry has undergone a massive transformation with streaming platforms becoming the dominant mode of music consumption. These platforms rely heavily on sophisticated recommendation algorithms and data analytics to keep listeners engaged. This trivia question explores how one major streaming service revolutionized music retail analytics to maintain its competitive edge.

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Discover Weekly - personalized playlists generated algorithmically each Monday based on listening patterns and preferences
Spotify Connect - allowing seamless transition between devices while playing music
Family Plan - enabling multiple household members to share a premium subscription at a reduced rate
Spotify for Artists - providing musicians with detailed analytics about their listeners and streaming performance