Which algorithmic innovation did Spotify introduce in 2015 that dramatically improved music recommendations by analyzing audio characteristics rather than just user behavior?

The music streaming revolution has transformed how we discover new artists and songs. Behind these personalized recommendations are sophisticated algorithms that analyze listening patterns and preferences. This poll tests your knowledge about a groundbreaking algorithmic innovation that changed how streaming platforms connect listeners with music they'll love.

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Echo Nest's audio fingerprinting technology
SoundCloud's waveform analysis system
Apple Music's genre classification algorithm
Pandora's melodic pattern recognition