Which music streaming service first implemented collaborative filtering AI for personalized music recommendations that became an industry standard?

Streaming services have transformed how we discover and consume music, with personalization algorithms playing a crucial role in listener retention and engagement. Behind the scenes, sophisticated machine learning powers these recommendations, but which platform pioneered the technology that changed the industry? Test your knowledge of music tech innovation!

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Spotify with its Discover Weekly feature (2015)
Pandora with its Music Genome Project (2000)
Apple Music with its For You recommendations (2015)
Last.fm with its Audioscrobbler system (2002)