tranquility of california, americans are tuning out and tuning in. >> when i think of technology in the 1980s, i think of the walkman. the walkman was huge. >> it's the latest fad. tiny stereo cassette players with featherweight headphones. >> it's like carrying your stereo with you, you know, on your head. >> the walkman took listening to music from a fixed location in your home to mobile. >> you are witnessing the ultimate miniaturization of the cassette player. never has so much genius been coaxed into so little space. >> in all the great bursts of innovation, there is always some kind of scientific breakthrough that has to happen first. and none of this stuff could have happened in the 1980s without the transistor being invented in the late 1940s. and japan and sony in particular really understood this technology could make things smaller, more versatile. sony was the brand name that really mattered in the 1980s in