Which music retail digital transformation initiative first introduced the 'pay-per-song' model that disrupted the traditional album-based sales approach?

The music industry has undergone one of the most dramatic digital transformations in retail history. From vinyl records to streaming services, the way music is sold and consumed has continuously evolved. This trivia question tests your knowledge about a pivotal moment in music retail's digital transformation journey that changed customer loyalty and business models forever.

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Apple's iTunes Store (2003)
Napster's subscription service (2001)
Amazon's MP3 Store (2007)
Microsoft's Zune Marketplace (2006)