Every few years or so we drive from Dallas to California. Everything from Stevie Ray Vaughn (my favorite) to Beethoven is played on the way there.
If you're a SRV fan, you might also want to check out Johnny Winter as well, if you haven't already. SRV was heavily influenced by Johnny Winter, and Muddy Waters called him his "son." Speaking of Muddy Waters, "Hard Again" is a terrific CD. And Johnny Winter plays on it too.
One of the best driving Johnny Winter CDs is Illustrated Man. Just keep an eye on your speed while it's playing.
Mark