Which music product innovation was first introduced by Sony in 1979, revolutionizing portable music listening and selling over 400 million units worldwide?

The music industry has been shaped by countless product innovations that transformed how we create, distribute, and experience music. From the phonograph to streaming services, these technological breakthroughs have revolutionized the industry landscape. This trivia question explores a significant product innovation that changed music consumption patterns forever. Test your knowledge of music industry history and the revolutionary products that defined new eras!

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The Walkman portable cassette player
The MiniDisc portable digital audio disc player
The Discman portable CD player
The iPod digital audio player