Which music retail innovation first allowed consumers to purchase and download individual songs rather than complete albums, fundamentally changing music e-commerce?

The digital transformation of the music industry has completely reshaped how consumers discover, purchase, and experience music. From physical records to digital downloads to streaming, each technological shift has created new retail models and consumer behaviors. This trivia question focuses on a pivotal moment in music e-commerce that changed the industry's trajectory forever. Test your knowledge about the business side of music!

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