Most musicians are notoriously nervous of playing support gigs, as how the crowd will respond is such a huge unknown. It's pretty important that the headliner and support are matched musically in a way that at least suggests that they might have listened to one or two of the same records.
PJ Harvey, in her masterpiece Let England Shake, in a more considered fashion directly challenges the establishment, "How is our glorious country ploughed? Not by iron ploughs. Our land is ploughed by tanks and feet. Feet marching. Oh America, oh England."