are the greatest musicians of all time 
(ROOT (VP (VBP are) (NP (NP (DT the) (JJS greatest) (NNS musicians)) (PP (IN of) (NP (DT all) (NN time))))))
(ROOT (VP (VBP ) (NP (NP (DT ) (JJS ) (NNS )) (PP (IN ) (NP (DT ) (NN ))))))