Which music retail innovation first implemented the 'collaborative filtering' algorithm that revolutionized personalized recommendations, significantly influencing how consumers discover new music?

The music retail landscape has undergone dramatic transformation in the digital age. From vinyl records to cassettes, CDs to downloads, and now streaming services - the industry continually evolves. This trivia question tests your knowledge of a pivotal innovation that revolutionized how consumers discover and purchase music, creating a new retail paradigm that combines personalization, convenience, and data analytics to drive music consumption.

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Pandora Radio's Music Genome Project
Last.fm's Audioscrobbler technology
Apple's iTunes Genius feature
Spotify's Discover Weekly algorithm