The Walkman (1979)
Few commercial products defined the 1980s like Sony's Walkman, which arrived in 1979 as a convenient, fashionable way to make an already portable innovation even more portable. The Walkman represented a true synergy of music tech, for it wouldn't have been possible without Phillips' cassette tape or Nathaniel Baldwin's headphones. Also, Sony exec and music fan Masaru Ibuka traveled a lot and wanted something more compact than a typical cassette recorder to play back albums. Enter the Walkman (or, as it was first dubbed in America, the Sound-About), and thus commenced an era of casually neglecting passersby on streets, buses and in airplanes. Amen.