Which pioneering feature did Spotify introduce in 2015 that revolutionized personalized music discovery through algorithmic curation?

In today's digital music landscape, personalization algorithms shape how we discover and consume music. These sophisticated systems analyze our listening patterns, preferences, and behaviors to curate playlists and recommendations that feel eerily perfect. Test your knowledge about how these technologies are revolutionizing the music retail experience and changing artist-fan relationships in the streaming era.

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Discover Weekly, which creates personalized playlists based on listening habits and similar users' preferences
Song Radio, which generates similar tracks based on acoustic analysis of a selected song
Family Mix, which blends the tastes of multiple household members into collaborative playlists
Audio Aura, which categorizes listeners by color-coded mood profiles based on their most-played genres