Which pricing innovation did Spotify first introduce that fundamentally changed the music retail landscape and became the industry standard for music streaming services?

The music industry has undergone massive transformation in how products are delivered and consumed. From vinyl records and cassette tapes to digital downloads and now streaming services, retail strategies have continuously evolved. This trivia question focuses on a pivotal innovation that reshaped music retail economics and consumer behavior in the streaming era.

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Freemium model with ad-supported tier and premium subscription option
Pay-per-song streaming (similar to iTunes but as streams)
Family plan subscriptions allowing multiple users under one account
Dynamic pricing based on song popularity and demand