O Walkman, um leitor portátil de cassetes da Sony, foi lançado comercialmente a 1 de Julho de 1979. Eis alguns recursos online para recordar a sua história:

The History Of The Walkman: The First Portable Music Player

Timeline and History of the Walkman

14 Very Loud Facts for The Sony Walkman’s 40th Birthday

The history of the Walkman: 35 years of iconic music players

Information on a wide range of portable audio and video products made by Sony