Radio2 as main listen.
iPod has a good mix of all kinds - rock/classical/general
I have playlists set up for driving
Driving = general mix of favourites
Fast = selected music to match spirited driving inc ZZTop/ACDC/Meatloaf/Stones/Clapton/George Thorougood/classical and many more
Mind you, above 50mph the volume needs to be high!