more a gunfest than a rock concert . 
(ROOT (NP (NP (RBR more) (DT a) (NN gunfest)) (PP (IN than) (NP (DT a) (NN rock) (NN concert))) (. .)))
(ROOT (NP (NP (RBR ) (DT ) (NN )) (PP (IN ) (NP (DT ) (NN ) (NN ))) (. )))