Rock is dead? Where the hell did that come from? Did you just pull that one out of your hat? Tolerance, young buck, that's what makes all the great flavours of music come alive.
I like different styles when working out. I don't, however, need to fill my impressionable mind with thoughts of raping my mother and eating out my sister, in order to intensify my work out. Nope, intesity comes from within. Otherwise I'd just go beatup a (insert derogatory refference here) before my workouts and then really have an intense workout.