a good music documentary , probably one of the best since the last waltz . 
(ROOT (NP (NP (DT a) (JJ good) (NN music) (NN documentary)) (, ,) (NP (ADVP (RB probably)) (NP (NP (CD one)) (PP (IN of) (NP (NP (DT the) (JJS best)) (PP (IN since) (NP (DT the) (JJ last) (NN waltz))))))) (. .)))
(ROOT (NP (NP (DT ) (JJ ) (NN ) (NN )) (, ) (NP (ADVP (RB )) (NP (NP (CD )) (PP (IN ) (NP (NP (DT ) (JJS )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))) (. )))