Which innovative retail recommendation feature did Spotify pioneer that dramatically changed how consumers discover new music artists?

The music industry has undergone massive transformation in how consumers discover and purchase music. Retail recommendation systems have become the backbone of modern music consumption, influencing what we hear and ultimately buy. This trivia question explores how streaming platforms have revolutionized music retail through their sophisticated recommendation algorithms.

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Discover Weekly, a personalized playlist that uses collaborative filtering to recommend new music based on listening patterns
Song Radio, which creates a queue of similar songs based solely on the musical characteristics of a selected track
Friend Feed, which recommends music based exclusively on what your social connections are currently listening to
Genre Stations, which recommend music based only on predefined categories and editorial curation