Which innovative machine learning technique revolutionized Spotify's music recommendation system when they acquired The Echo Nest in 2014?

Music streaming services have revolutionized how we discover and consume music. Behind these platforms are sophisticated recommendation algorithms that analyze listening patterns and introduce users to new artists. These machine learning systems have transformed music from a purely creative industry to one powered by data science. Test your knowledge about how streaming services use machine learning to shape the music landscape and influence consumer behavior.

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Audio fingerprinting technology that identifies songs based on acoustic patterns
Deep convolutional neural networks that analyze album cover art for visual similarity
Audio analysis algorithms that identify sonic attributes like tempo, key, and timbre
Natural language processing that exclusively analyzes user-generated playlists