Which music retail innovation first used collaborative filtering algorithms to generate personalized recommendations at scale, forever changing how consumers discover new music?

The music retail landscape has undergone dramatic transformations with technological advancements. From vinyl records to streaming services, the way music reaches consumers has evolved significantly. This poll tests your knowledge about a pivotal innovation in music retail that revolutionized how consumers discover and purchase music, fundamentally changing the industry's data analytics and personalization capabilities.

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Apple's iTunes Genius feature (2008)
Pandora's Music Genome Project (2000)
Amazon's music recommendation engine (2007)
Last.fm's Audioscrobbler system (2002)