Which music retail product launch in the early 2000s revolutionized digital sales by introducing the concept of à la carte purchasing of individual songs for $0.99 each?

The music industry has undergone dramatic transformations in how products are launched and sold to consumers. From vinyl records to streaming platforms, the retail strategies for music have evolved significantly. This trivia question focuses on a pivotal product launch that changed how music is purchased and consumed. Test your knowledge of music retail history and the innovative approaches that have shaped the industry!

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Apple's iTunes Store (2003)
Amazon MP3 Store (2007)
Napster 2.0 Subscription Service (2003)
Microsoft Zune Marketplace (2006)