Which music streaming innovation significantly disrupted traditional retail models by introducing the first major 'all-you-can-listen' subscription model for mainstream consumers?

The music industry has undergone massive technological transformation in the past two decades. From physical media to digital downloads to streaming platforms, the way music products are designed, distributed, and monetized has fundamentally changed. This trivia question focuses on a pivotal development in music retail technology that transformed how consumers access music products.

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Spotify's Premium subscription service (launched 2008)
Apple's iTunes Store (launched 2003)
Pandora Radio's customized playlists (launched 2000)
Amazon's MP3 Store (launched 2007)