Which streaming innovation did Spotify pioneer in 2013 that fundamentally changed how artists and labels view streaming revenue?

The music industry has undergone one of the most dramatic digital transformations of any retail sector. From vinyl to cassettes to CDs to downloads to streaming, the business model has continuously evolved. This poll tests your knowledge about how streaming platforms have revolutionized music consumption, artist compensation, and the overall industry structure. How well do you understand the economics and technology behind today's music business?

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The 'pay-per-stream' model where artists earn a fixed rate per stream regardless of subscription type
The 'Spotify for Artists' dashboard that provided unprecedented analytics access to musicians
The implementation of blockchain technology for royalty distribution
The introduction of exclusive artist content available only to premium subscribers