#MusicHistoryMonday: We mark the introduction on July 1, 1979 – 45 years ago today – of the Sony Walkman. The Walkman was the first entirely portable, high-fidelity (or at least fairly high-fidelity) audio cassette player, an absolutely revolutionary device that allowed a user to listen to entire albums anywhere, anytime. Introduced initially in Japan, the higher-ups at Sony expected to sell 5000 units a month for the first six months after its release. Instead, they sold 30,000 units in the fir