Which retail technology innovation first allowed consumers to legally purchase and download individual songs rather than full albums, fundamentally changing music industry sales patterns?

The music industry has undergone massive retail transformations in the digital age. From vinyl shops to streaming services, how we purchase and consume music has evolved dramatically. This poll tests your knowledge about a significant retail technology shift that changed how music is sold and consumed - a turning point that redefined the industry's business model.

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Apple's iTunes Store (2003)
Napster's subscription service (2001)
Amazon's MP3 Store (1999)
Microsoft's Zune Marketplace (2000)