Talk about going for the throat. Only halfway through their twelve-song debut, the Four Horsemen deliver three manifestoes – "Rockin' Is Ma' Business," "Can't Stop Rockin' " and "Let It Rock" – and enough Marshall-stack frenzy to render them the van-guard in the flourishing boogie renaissance. And with Guns n' Roses, the Black Crowes and a horde of lesser guitar obsessives having made...