Which retail technology innovation first allowed consumers to legally purchase and download individual songs rather than entire albums, dramatically changing music industry sales models?

The music industry has undergone dramatic transformations due to retail technology advancements. From physical records to digital downloads to today's streaming services, technology has continuously reshaped how consumers discover, purchase, and experience music. This poll tests your knowledge about a pivotal retail innovation that fundamentally changed music consumption patterns and created new business models in the pop culture landscape.

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Apple's iTunes Store (2003)
Napster's P2P service (1999)
Amazon MP3 Store (2007)
Microsoft's Zune Marketplace (2006)