Which music retail technology innovation first enabled 'variable pricing' for individual songs rather than forcing consumers to purchase entire albums?

The music retail industry has undergone dramatic transformations in the past few decades, from vinyl records to streaming services. This evolution has reshaped not only how we consume music but also how artists monetize their work. Test your knowledge about key technological shifts that changed music retail forever and how they impacted consumer behavior and industry economics.

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Apple's iTunes Store (2003)
Napster's peer-to-peer file sharing (1999)
Amazon's MP3 Store (2007)
Spotify's streaming platform (2008)