Well, I learn something new every day! Since I have a 10-year old car, no wonder I don’t have a USB port, and I don’t see a new car in my future. In fact I don’t see much of a future if something doesn’t happen in November. I’ll just have to sing to myself in the car.
If your car has a cassette tape player, you can get an mp3 minijack to cassette cartridge convertor. I do this with an older car that doesn’t have a port.