Cruising around I usually listen to metal/hard rock. The few times I ever go mudding it's country(cliche I know). If I'm actually on a trail I usually don't listen to anything so I can hear if something funky is going on. That's something my buddy always did so I sort of got it from him.
Metal all day. On the trails I usually keep it quiet to keep an ear open for bad sounds lol but on the road and when the trails open up, metal and all of its sub categories