Which innovative marketing strategy did Spotify introduce in 2015 that transformed how streaming platforms monetize their services?

The music industry has undergone dramatic changes in how consumers access and enjoy music. Streaming services have revolutionized the industry's business model, affecting everything from artist compensation to marketing strategies. This trivia question explores a significant market trend that reshaped the economics of music streaming services and impacted how artists and labels approach their revenue streams.

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Spotify Wrapped - personalized year-end listening statistics
Spotify Connect - multi-device streaming control
Spotify for Brands - programmatic audio advertising platform
Spotify Family Plan - discounted multi-user subscriptions