I tend to listen to classical stuff while wheeling, but turn it off when the going gets tricky.. I like to be able to hear what's going on around me.
I don't like to listen to stuff while wheeling that tends to get the adreneline pumping... I prefer more calming sedated stuff. Seems to keep me from doing more aggressive stuff with the jeep leading to less breakage.
For just tooling around town, by myself: Disturbed, any Metallica, NIN, any heavy metal, we have a station in erie called Planet Radio 93.9 they play all new rock and metal. With the wife: country music, Garth, Tim, Gary Allen, Kenny, and Country 98 WXTA.
For off road I need something a little calmer to keep me from wigging out and trashing something so then I listen to: U2, Pink Floyd, Peter Gabriel, Depech Mode, Eagles, There is no station that plays all that stuff so if I get into some serious s*^t I just turn it all off.
I have a great one for getting the great mindset until the volume comes down... Darude "Sandstorm", its techno/danco, but it gets you pumped up... but then its everything already listed before, maybe a little G'n'R welcome to the jungle or sweet child o mine