Which machine learning technique is NOT commonly used by major music streaming platforms for song recommendations?

In recent years, streaming platforms have revolutionized how we discover and consume music. These platforms use sophisticated machine learning algorithms to analyze listening habits and provide personalized recommendations. But how much do you know about the technology that powers your music discovery? Test your knowledge about the data science behind modern music consumption!

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Reinforcement learning with realtime user interaction rewards
Collaborative filtering based on listening habits of similar users
Natural language processing to analyze song lyrics and user reviews
Audio signal processing to identify sonic characteristics and patterns