On the open road and on urban freeways:

Allman Bros Band: Jessica (several versions) In Memory of Elizabeth Reed
(many versions) and Back Where It All Begins (a couple versions). At rush
hour I sometimes need to ditch "Jessica" because it makes me too
aggressive in my driving.

When I get to where I want to be: R. Carlos Nakai (native American flute).

Anywhere: Linda Ronstadt, Mary Chapin Carpenter, Chris Izaak.

When the mood strikes: Leonard Bernstein, Chichester Psalms.

Always with me, though rarely played, but just in case the mood strikes:
"Whiter Shade of Pale"

Mark Hineline