Walkman is a Sony brand tradename originally used for portable audio cassette players in the late 1970s.The original Walkman actually introduced a change in music listening habits by allowing people to carry recorded music with them and listen to music through lightweight headphones. Owners of the Walkman were able to take back their “lost” time, commuting for example, and turn it into a pleasurable experience, or add a soundtrack to their urban surroundings. It was the privatization and personalization offered by the Walkman that lead to its success. The prototype was built in 1978 by audio-division engineer Nobutoshi Kihara for Sony co-founder Masaru Ibuka. Ibuka wanted to be able to listen to operas during his frequent trans-Pacific plane trips, and presented the idea to Kihara. The original idea for a portable stereo is credited to Brazilian-German inventor Andreas Pavel. The first Walkman was marketed in 1979 in Japan, using the name Walkman.