Which music retail innovation first introduced the controversial '$0.99 per song' pricing model that disrupted traditional album sales?

The music retail industry has undergone massive transformation in the past few decades. Physical album sales once dominated the market through specialized record stores and large retail chains, but digital disruption changed everything. This poll tests your knowledge about a pivotal moment in music retail history that fundamentally altered consumer behavior and industry pricing strategies.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Apple's iTunes Store (2003)
Napster's peer-to-peer service (1999)
Amazon MP3 Store (2007)
Microsoft's Zune Marketplace (2006)