Which music e-commerce innovation first introduced the 'pay-per-song' model that disrupted the traditional album-only sales approach?

The digital revolution transformed how we purchase and consume music. From physical stores to online platforms, the music retail landscape has undergone dramatic changes. This trivia question explores a key moment in the evolution of online music retail that fundamentally altered the industry's business model and consumer behavior. Test your knowledge about the strategic moves that shaped today's digital music marketplace!

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Apple's iTunes Store (2003)
Amazon MP3 Store (2007)
Napster 2.0 subscription service (2003)
Sony Connect Music Store (2004)