Which music retail technology innovation first introduced the 'pay-per-stream' model that revolutionized how artists earn royalties in the digital age?

The music industry has undergone dramatic transformations due to technological advancements in retail delivery systems. Streaming platforms have revolutionized how consumers discover, purchase, and experience music, creating new business models that have permanently altered the landscape for artists, labels, and listeners alike. This trivia question explores a pivotal moment in music retail technology that shaped today's digital music ecosystem.

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Spotify's Premium subscription service (2008)
Apple's iTunes Store per-song purchasing (2003)
YouTube Content ID's monetization system (2007)
Pandora Radio's advertising revenue sharing (2005)