Which groundbreaking feature did Spotify introduce in 2015 that revolutionized music discovery and personalization in the streaming industry?

The digital transformation of music consumption has dramatically changed how we discover, access, and enjoy our favorite artists. Music streaming platforms have invested heavily in technological advancements to enhance user experience and maintain competitive edge. This trivia question focuses on a pivotal moment in the digital transformation journey of one of the industry's leading platforms. Test your knowledge about how these services have evolved to shape modern music consumption!

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Discover Weekly, an algorithmic personalized playlist refreshed every Monday
Spotify Connect, allowing seamless device switching while playing music
Spotify Wrapped, the annual personalized listening summary
Spotify for Artists, giving musicians analytics about their listeners