Which music retail innovation first introduced the 'personalized algorithmic playlist' concept that now dominates how streaming services recommend music to listeners?

The music industry has undergone massive transformation in how consumers access and purchase music. Streaming services revolutionized the retail landscape, but do you know which innovation truly changed the game? Test your knowledge about the pivotal moments in music retail history that shaped how we discover, consume, and pay for music today.

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Pandora's Music Genome Project (2000)
Apple's iTunes Genius feature (2008)
Spotify's Discover Weekly (2015)
Last.fm's Audioscrobbler system (2002)