I did some transfers to a flash drive for him. But he still wishes he had a simple stupid CD player in his 2019 Hyundai
Meanwhile I was told by the salesman that the USB port on my new (for me) Fit was just for charging. I was delighted to find that it played tunes from my flash drive. I don't have 5K tunes. More like 400 including Doors, Stones and House of the Rising Sun by the Animals. View From a Kill by Duran Duran. Red Rain too.
Years ago, I discovered Newsgroups had all sorts of music posted and nobody was bothering those who uploaded/downloaded the tunes as they were with the music sharing sites...gathered quite a collection.