not only a pianist , but a good human being 
(ROOT (NP (CONJP (RB not) (RB only)) (NP (DT a) (NN pianist)) (, ,) (CC but) (NP (DT a) (JJ good) (JJ human) (NN being))))
(ROOT (NP (CONJP (RB ) (RB )) (NP (DT ) (NN )) (, ) (CC ) (NP (DT ) (JJ ) (JJ ) (NN ))))