If you were alive within the Eighties, the Sony Walkman was most likely an enormous part of your life. The first model of this groundbreaking know-how was the TPS-L2, and it allowed people to play their very own private soundtrack anywhere and anytime; its portability meant that you never needed to go wherever with out your favourite tunes. These days, of course, we carry hundreds of songs in our pockets, but again then, we needed to deal with cassettes.