What retail innovation did Apple introduce alongside the iPod in 2003 that revolutionized how music was sold?

When Apple introduced the iPod in 2001, it forever changed how music was sold and consumed. This revolutionary device, coupled with the iTunes Store launch in 2003, transformed the retail music landscape from physical stores to digital downloads, eventually paving the way for streaming services. Test your knowledge about this pivotal retail innovation that reshaped an entire industry's business model and consumer behavior.

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iTunes Store with 99-cent individual song purchases
Apple Music subscription service
iPod Mini with expanded storage capacity
iCloud music backup service