Which music streaming platform was the first to implement collaborative filtering for personalized music recommendations at scale?

Music streaming platforms invest heavily in recommendation systems that analyze listening habits to suggest new songs and artists. These sophisticated algorithms are critical for user engagement and discovery in the crowded digital music landscape. How well do you understand the technology behind the music recommendations that influence millions of listeners daily?

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Spotify with its Discover Weekly feature
Pandora with its Music Genome Project
Apple Music with its For You playlists
Amazon Music with its Personalized Stations