Which pioneering technique did Spotify introduce in 2015 that revolutionized their music recommendation system by combining neural networks with contextual user data?

The music industry has been transformed by sophisticated recommendation algorithms that help listeners discover new artists and songs. These systems analyze listening habits, preferences, and even contextual data to suggest music that keeps users engaged on streaming platforms. How well do you understand the technology behind the music recommendations that shape your playlists and listening habits?

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Discover Weekly personalized playlists
Mood-based collaborative filtering
Lyrics-based semantic analysis
BPM-matched transition algorithms