There is – don’t laugh! – an instrumental song on the Windham Hill label that was on a cassette tape playlist someone made for me many years ago. Timing was such that it played at a place in the road where there were a couple of significant hills which I was driving at dawn, and I swear the swells in the music matched the damn road so perfectly that I can still feel the experience in my bones. Perfect daybreak music in a rolling hills part of the country:
I guess my point is, any music can be perfect for a driving playlist. It all depends on context and timing.
(Accidentally posted this in the OTHER road trip thread)
Considering the two types of radio stations you’re likely to encounter in the stretches between major cities, I’d go with country over Christian (MUCH better music):