Which music retail innovation introduced the first successful large-scale personalization algorithm that revolutionized music discovery for consumers?

The music retail landscape has undergone massive transformation in recent years. From physical stores to digital platforms, from CDs to streaming services - the way we discover, purchase and consume music continues to evolve rapidly. This trivia question tests your knowledge about a significant innovation that revolutionized the customer experience in music retail. Think about how technology has changed the way consumers interact with music products!

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Spotify's Discover Weekly, launched in 2015, which uses collaborative filtering and natural language processing to create personalized playlists
Apple's Genius Sidebar, introduced in iTunes 2008, which suggested music based solely on purchase history
Amazon's Music Genome Project, launched in 2010, which categorized songs based on over 450 attributes
Google Play's Neural Mixer, released in 2013, which used neural networks to blend user preferences with trending music