a group of extremely talented musicians 
(ROOT (NP (NP (DT a) (NN group)) (PP (IN of) (NP (ADJP (RB extremely) (JJ talented)) (NNS musicians)))))
(ROOT (NP (NP (DT ) (NN )) (PP (IN ) (NP (ADJP (RB ) (JJ )) (NNS )))))