Get one of the low profile USB drives. They come in multiple storage sizes (not only 256GB) and they are much more convenient in the car.
https://www.amazon.com/SanDisk-Cruzer-Low-Profile-Drive-SDCZ33-016G-B35/dp/B005FYNSZA
https://www.bhphotovideo.com/c/product/1384375-REG/sandisk_sdcz430_256g_a46_ultra_fit_usb_3_1.html/?...
Yes, get all the music from CDs to computer and just transfer it to that USB drive.
https://www.amazon.com/SanDisk-Cruzer-Low-Profile-Drive-SDCZ33-016G-B35/dp/B005FYNSZA
https://www.bhphotovideo.com/c/product/1384375-REG/sandisk_sdcz430_256g_a46_ultra_fit_usb_3_1.html/?...
Yes, get all the music from CDs to computer and just transfer it to that USB drive.