re: #5 Belafon

Someone may have already invented this, but use a laser to read vinyl and you could have a player built into your car.

And once you’ve read the vinyl disc with a laser and digitised it you can retain the data and replay it, three times or more. You could call the data file a Music Player 3 or MP3 for short. You wouldn’t even have to have the vinyl record in your car, you could keep it in the temperature-controlled pressurised room filled with inert krypton gas you have at home to maintain its pristine condition.