Before the iPod was even a thought, Sony had sold hundreds of millions of its iconic cassette players
Walkman - Wikipedia
iPod - Wikipedia
Today in Music History: Sony introduced the Walkman
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The history of the Walkman: 35 years of iconic music players - The Verge
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The Walkman turns 35: What was the first song you played?
Cassette tape - Wikipedia
The history of the Walkman: 35 years of iconic music players - The Verge, walkman cassette
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The history of the Walkman: 35 years of iconic music players - The Verge, walkman cassette
Do you think Apple computers would have survived if not for the invention of the iPad, iPhone, and iPod? - Quora