You may be too young to remember, or maybe you do and would rather not, the once familiar scene of somebody walking down the street with a transistor radio pinned to his ear. Back in the seventies, it was quite common to see people bobbing their heads to a beat only they could hear, distracted from the rest of the world. One can imagine how a young person today would find the image ridiculous, as he straps on his MP3 player and goes about his day in the same ...
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