Which innovative product development approach did Spotify use to create its hugely successful 'Discover Weekly' personalized playlist feature?

The modern music industry has transformed dramatically with technology. Product development teams at major streaming platforms are constantly innovating to improve listener experiences and artist tools. This trivia question explores how these companies use data to shape new features that have revolutionized how we consume music. Test your knowledge about the intersection of product development and music streaming technology!

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Collaborative filtering algorithms that analyze listening patterns across similar users
Direct artist submissions of recommended tracks for listeners based on genre preferences
Manual curation by music experts who select tracks for different listener demographics
Natural language processing of music reviews to match songs with listener sentiment profiles