The Walkman was created by Sony as a way to take cassettes on the go. Now people could easily listen to their favorite music anytime, anywhere.

Pierce, David. “Sony’s Walkman Turns 35: The Gadget That Started It All.” The Verge. July 1, 2014. https://www.theverge.com/2014/7/1/5861062/sony-walkman-at-35..