Which music retail technology innovation first allowed consumers to legally purchase and download individual songs rather than entire albums?

The music industry has undergone massive technological transformations in how products are sold and distributed. From vinyl records to streaming services, the retail technology behind music has constantly evolved to meet consumer demands and industry changes. This trivia question tests your knowledge about a significant technological shift in music retail that changed how consumers access their favorite songs.

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Apple's iTunes Store (2003)
Amazon MP3 Store (2007)
Napster's relaunch as a legal service (2003)
Microsoft's Zune Marketplace (2006)