Which of the following AI techniques is NOT commonly used by major music streaming services to generate personalized music recommendations?

The music industry has been transformed by streaming services that use sophisticated algorithms to deliver personalized recommendations to listeners. These platforms analyze massive amounts of data to understand listener preferences and behavior. But how well do you understand the technology behind these music recommendation systems? Test your knowledge about the data science powering your favorite music streaming experiences!

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Collaborative filtering based on similar users' listening habits
Natural language processing to analyze lyrical content and themes
Blockchain-based consensus algorithms to determine song popularity
Audio signal processing to analyze acoustic features like tempo and energy