Recommendations Wanted: Driving Music

Packing the family into the SUV and making 2 long trips over the holidays. Heading to Tower Records on Tuesday to stock up on new tunes, so I'd be much obliged if the Musings staff could make a few recommendations for stuff that I've never heard that would make the trips better. No real preference for style, other than to note that I'll be toting 2 little ones, so the fewer the f-bombs, the better.