of the best since the last waltz 
(ROOT (PP (IN of) (NP (NP (DT the) (JJS best)) (PP (IN since) (NP (DT the) (JJ last) (NN waltz))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJS )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))))