Which streaming service innovation is credited with saving the music industry by introducing a sustainable subscription model after years of declining revenue due to piracy?

The music industry has undergone a dramatic transformation with the rise of streaming services and subscription models. This shift has fundamentally changed how artists monetize their work and how listeners consume music. Test your knowledge about the evolution of music subscription models and their impact on the industry landscape. Do you know which innovation truly revolutionized the modern music business model?

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Spotify's Premium tier with offline listening capability (2008)
Apple's iTunes Store per-song purchasing model (2003)
Pandora Radio's advertising-supported streaming (2005)
YouTube Music's content creator revenue sharing program (2015)