Which retail customer analytics technique revolutionized Spotify's music recommendation system in 2015 with its introduction of the 'Discover Weekly' personalized playlist feature?

The music industry has transformed dramatically in the digital age, with streaming platforms and online retailers leveraging sophisticated analytics to personalize recommendations and boost engagement. Behind the scenes, these platforms employ complex algorithms and data analysis techniques to understand listener preferences and behaviors. This trivia question tests your knowledge about how modern music retailers analyze customer data to drive business decisions.

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Collaborative filtering combined with natural language processing of music reviews
Purely demographic-based segmentation analyzing age and location data
Random forest algorithms analyzing only purchase history
Simple genre matching based on manual tagging by music experts