Which of these retail innovations first allowed consumers to legally purchase individual digital music tracks rather than entire albums, permanently disrupting the traditional music retail model?

The music industry has undergone dramatic transformations in how consumers purchase and experience music products. One retail innovation in particular revolutionized the entire industry's business model in the early 2000s, creating both opportunities and challenges for traditional music retailers. Test your knowledge about this pivotal moment in music retail history that changed how we consume music forever.

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