Which product innovation, introduced by Sony in 1979, revolutionized portable music consumption and sold over 400 million units worldwide before being discontinued in 2010?

The music industry has continuously evolved through groundbreaking product innovations that changed how we consume and experience music. From vinyl to digital streaming, these technological leaps have redefined the industry landscape. This trivia question focuses on a pivotal product innovation that revolutionized how people listened to music on the go, creating new revenue streams and listening habits that continue to influence product design in the music industry today.

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The Walkman portable cassette player
The MiniDisc portable audio system
The Discman portable CD player
The Digital Audio Player (DAP)