Which music e-commerce innovation first allowed consumers to purchase individual songs rather than entire albums, fundamentally disrupting traditional music industry revenue models?

The digital revolution transformed how music is sold and consumed. From physical media to digital downloads to streaming, music e-commerce has undergone radical changes that reshaped the industry's business models. This trivia question examines a pivotal moment in the evolution of online music sales that dramatically changed consumer behavior and industry revenue streams.

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Apple's iTunes Store (2003)
Amazon MP3 Store (2007)
Bandcamp's artist platform (2008)
Napster's paid service relaunch (2003)