Which groundbreaking personalization algorithm first used collaborative filtering to create personalized music recommendations that significantly boosted user engagement and transformed music retail?

The music industry's retail landscape has evolved dramatically in the digital age. From vinyl's resurgence to streaming dominance, how music reaches consumers involves complex psychology and marketing strategies. This poll tests your knowledge about a fascinating retail personalization strategy that helped revolutionize music discovery and consumption patterns in the streaming era.

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Spotify's Discover Weekly (2015)
Apple Music's For You (2017)
Pandora's Music Genome Project (2000)
Amazon Music's Song Sommeliers (2016)