Which innovative retail technology did Spotify first implement in 2013 that revolutionized music recommendation personalization and significantly reduced customer churn?

The music industry has been transformed by digital retail experiences and innovations. From vinyl records to streaming platforms, the way we discover, purchase, and consume music continues to evolve. This trivia question explores a significant retail technology advancement that changed how music platforms personalize recommendations and improve user experiences. Test your knowledge of the music industry's retail innovation landscape!

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• The Echo Nest acquisition and implementation of its machine learning algorithms
• Blockchain-based smart contracts for artist payment transparency
• Voice-activated recommendation engine powered by natural language processing
• Augmented reality music discovery interface for physical album scanning

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