Which pioneering personalization algorithm revolutionized music streaming by analyzing audio characteristics rather than just user behavior?

In the digital music landscape, streaming platforms have transformed how artists reach audiences and how success is measured. Behind the user interfaces we interact with daily lie sophisticated personalization algorithms that determine what music gets recommended to listeners. Test your knowledge about the technology that shapes music discovery in the streaming era!

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The Echo Nest's Acoustic Analysis Engine (acquired by Spotify)
Apple Music's Adaptive Curation System
Pandora's Melodic Pattern Recognition
Amazon's Rhythmic Preference Algorithm