Which product innovation first allowed consumers to legally purchase and download individual songs rather than entire albums, fundamentally changing the music retail model?

The music industry has seen revolutionary product innovations that changed how we consume and experience music. From vinyl records to streaming services, technology has constantly reshaped the landscape. This trivia question focuses on a pivotal innovation moment that transformed the music industry and set the stage for modern digital music consumption. Test your knowledge of music technology history!

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Apple's iTunes Store (2003)
Napster's peer-to-peer service (1999)
Sony's MiniDisc format (1992)
Amazon MP3 Store (2007)