Since its release in 2001, Apple kept reinventing its revolutionary music player with the Shuffle, Nano and Touch.
Apple discontinues iconic product 20 years after first release
Apple discontinuing iPod Shuffle, Nano, Science and Technology
A Visual History of the Apple iPod
Shuffle, Nano, Touch: Two Decades of the Apple iPod
Apple to discontinue the iPod after more than two decades
Apple discontinues iPod after 20-year run
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How Apple can save the iPod - CNET