Which innovative retail concept did Apple introduce in 2003 that transformed music distribution and consumption?

The music retail landscape has transformed dramatically in the digital age. From traditional record stores to streaming platforms, innovations in how music reaches consumers have revolutionized the industry. This trivia question tests your knowledge of a significant retail innovation that changed how consumers discover and purchase music. Do you know which technology disrupted traditional music retail models?

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iTunes Store, allowing individual song purchases for $0.99 instead of requiring full album purchases
Apple Music Stores, physical retail locations specializing in music equipment and recordings
iPod Exchange Program, where consumers could trade physical CDs for digital downloads
Apple Radio, the first algorithmic music recommendation service for digital purchases