Which music retail innovation first introduced the 'pay-per-track' model that allowed consumers to purchase individual songs instead of entire albums?

The music retail landscape has transformed dramatically in recent decades. From vinyl records to digital streaming, the way consumers discover, purchase, and experience music continues to evolve. This poll tests your knowledge about a significant retail innovation that revolutionized how consumers access music. Think about the technological shifts that have disrupted traditional music consumption patterns and the companies that led these changes.

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Apple's iTunes Store (2003)
Napster's P2P service (1999)
Amazon MP3 Store (2007)
Spotify's Premium service (2008)