Which music retail strategy, introduced around 2003-2004, revolutionized digital music sales by focusing on per-track purchasing rather than requiring full album purchases?

The music retail landscape has undergone dramatic changes in the past few decades. From vinyl records to streaming platforms, the way we discover, purchase, and consume music has been revolutionized. This poll tests your knowledge about a significant shift in music retail that changed how the industry approached brand management and customer loyalty in the digital era.

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Apple's iTunes Store 99-cent song model
Amazon's MP3 subscription service
Napster's legal relaunch payment structure
Microsoft's Zune Pass program