Which music retail innovation first surpassed $1 billion in revenue in a single year, fundamentally changing how consumers purchased music online?

The music industry has undergone dramatic transformations in how consumers purchase and access music. From physical media to digital downloads to streaming subscriptions, retail innovations have continuously reshaped the landscape. This trivia question focuses on a pivotal moment in music e-commerce that changed how consumers interact with music products forever. Test your knowledge about this industry-defining shift!

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Apple's iTunes Store digital downloads (2006)
Amazon's MP3 Store (2008)
Spotify Premium subscriptions (2011)
Beatport's electronic music marketplace (2009)