Hmmm...being a big Jazz and Classical music nerd, I listen to a lot of Dave Brubeck, Miles Davis, and various Downtempo artists when I'm just "cruising" around. Believe it or not I listen to intense classical pieces when I do some intense driving ie: highway 17 at 2am;). It is a very common misconcepition that all Classical music is "sleepy" music. The "sleepy" music people refer to is a sub-category of Classical called Impressionism(yeah like the painting style). Sorry, the whole Classical music puts me to sleep bit, is something that ignorant people say. My favorite driving works are Vivaldi's 4 seasons, specifically fall and winter; and how can one forget Bethoven's 9th, second movement; Bach's double violin concerto vivace<---pure sex!!! The list goes on and on. On long trips, though, I play a huge array of music, Country excluded.
Please excuse my cynicism, Philosophy minor here!:)