Which recommendation algorithm does Spotify use to power its famous 'Discover Weekly' personalized playlists?

The music industry has been revolutionized by streaming platforms that have changed how we consume music. These tech giants compete fiercely for market share, developing unique features and algorithms to personalize user experiences. This poll tests your knowledge about the personalization technologies behind one of the world's leading music streaming platforms. Can you identify which recommendation system powers which service?

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Collaborative Filtering combined with Natural Language Processing of audio content
Apple's Genius algorithm licensed to Spotify for recommendation purposes
Deep Beat - a neural network system developed exclusively for beat matching
Amazon's A9 algorithm modified for audio preference prediction