Which pricing strategy innovation did Spotify pioneer that revolutionized the music industry's revenue model in the late 2000s?

The music industry has undergone a massive transformation with the rise of streaming services. This has fundamentally changed how music is priced and sold to consumers. This trivia question explores an interesting pricing strategy innovation that revolutionized the music streaming landscape and helped turn around declining industry revenues. Test your knowledge about this pivotal business model that changed how millions of people access music!

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Freemium model with ad-supported tier and premium subscription options
Pay-per-song download structure with volume discounts
Artist-determined dynamic pricing based on popularity metrics
Blockchain-based micropayments directly to artists