an impressive and highly entertaining celebration of its sounds 
(ROOT (NP (NP (DT an) (ADJP (ADJP (JJ impressive)) (CC and) (ADJP (RB highly) (JJ entertaining))) (NN celebration)) (PP (IN of) (NP (PRP$ its) (NNS sounds)))))
(ROOT (NP (NP (DT ) (ADJP (ADJP (JJ )) (CC ) (ADJP (RB ) (JJ ))) (NN )) (PP (IN ) (NP (PRP$ ) (NNS )))))