Which AI-powered music recommendation technology was acquired by Spotify in 2014 that revolutionized their personalized playlist capabilities, including the highly successful 'Discover Weekly' feature?

The music industry has undergone dramatic transformations with digital technology. Streaming platforms have revolutionized how music is distributed, consumed, and monetized. This poll tests your knowledge about a key technological innovation that fundamentally changed how streaming services deliver personalized music recommendations to millions of users worldwide, creating the hyper-personalized music discovery experience we now take for granted.

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The Echo Nest
MusicBrainz
Gracenote
Last.fm's Audioscrobbler