Which digital music innovation, launched in 2003, is widely credited with legitimizing digital music sales and helping the industry begin to combat widespread piracy?

The music retail landscape underwent a seismic shift in the early 2000s when digital distribution began challenging traditional physical album sales. This transformation forced record labels and retailers to completely rethink their business models and distribution strategies. Test your knowledge about this pivotal moment in music retail history that forever changed how we consume music.

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Apple's iTunes Store
Napster's paid subscription service
Microsoft's Zune Marketplace
Amazon MP3 Store