Which innovative retail data analytics technique did Spotify first implement in 2013 that revolutionized music discovery and significantly increased customer engagement?

The music industry has undergone massive transformation with digital streaming platforms revolutionizing how consumers discover, purchase, and engage with music. Behind these platforms lies sophisticated retail data analytics that shape everything from artist royalties to personalized recommendations. Test your knowledge about how data analytics has transformed the business of music retail in the streaming era!

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Collaborative filtering algorithm called Discover Weekly that analyzes listening patterns across users to recommend new music
Purchase prediction model that identifies which songs users are most likely to buy based on previous downloads
Social graph analysis that recommends music based primarily on Facebook friend connections
Acoustic fingerprinting technology that categorizes songs by their sound profiles rather than genre tags