Man how far things have come from the eaarly days of Laser Disks and 8 Track tapes, they had terrible music quality and were really huge I remember throwing Laser Disks around my pop's front yard they used to be able to fly for quite some distance and had terrible quality and just try to take a Laser Disk to school with you. You want to take an 8 track to school with you, in your dreams and who would want to with the quality that they had. Then there were records which were even worse, worse quality and you could bring an LP to school, but why you would be really nervous over the thing that someone would accidently scratch the disk then it would be useless. Quality was for the birds.
I do not think that I can recall someone walking down the street with earphones on until the cassset decks came into general use and even then that was a bit of a stretch since they were so heave your pants would have to be nailed to your hips to support the casset deck. In the early years the things were referred to as casset decks rather than casset players or walkman. That was a term applied a bit latter, the walkman was and still is trade name.
These days I see kids walkiing down the street with headsets from an MP3 player and I try to imagine myself doing that in my earlier ears and I would have to have been nuts to attempt something like that, getting an LP player on my belt, right. Even if I could I right the sound quality was so terrible why.