Which digital music retail innovation first introduced the 'unbundling' concept that allowed consumers to purchase individual songs rather than entire albums, fundamentally changing the music industry's revenue model?

The music retail industry has undergone massive digital transformation over the past two decades. From physical record stores to streaming platforms, the way consumers discover, purchase, and experience music has fundamentally changed. This poll tests your knowledge about a pivotal moment in music retail's digital evolution that altered the industry's business model forever.

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Apple's iTunes Store with 99-cent individual song downloads (2003)
Napster's peer-to-peer file sharing platform (1999)
Amazon's MP3 Store with DRM-free downloads (2007)
Spotify's freemium streaming model (2008)