while the performances are often engaging , this loose collection of largely improvised numbers would probably have worked better as a one-hour tv documentary . 
(ROOT (S (SBAR (IN while) (S (NP (DT the) (NNS performances)) (VP (VBP are) (ADVP (RB often)) (ADJP (VBG engaging))))) (, ,) (NP (NP (DT this) (JJ loose) (NN collection)) (PP (IN of) (NP (ADJP (RB largely) (VBN improvised)) (NNS numbers)))) (VP (MD would) (ADVP (RB probably)) (VP (VB have) (VP (VBN worked) (ADVP (JJR better)) (PP (IN as) (NP (DT a) (NML (CD one) (HYPH -) (NN hour)) (NN tv) (NN documentary)))))) (. .)))
(ROOT (S (SBAR (IN ) (S (NP (DT ) (NNS )) (VP (VBP ) (ADVP (RB )) (ADJP (VBG ))))) (, ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (ADJP (RB ) (VBN )) (NNS )))) (VP (MD ) (ADVP (RB )) (VP (VB ) (VP (VBN ) (ADVP (JJR )) (PP (IN ) (NP (DT ) (NML (CD ) (HYPH ) (NN )) (NN ) (NN )))))) (. )))