(S (S (BASENP (NNP Spencer) (NNP Dryden)) (VP (VP (VBD was) (NP (BASENP (DT a) (NN member)) (PP (IN of) (BASENP (NNP Jefferson) (NNP Airplane))))) (PP (IN during) (NP (BASENP (DT the) (NN band) (POS 's)) (NN heyday))))) (PERIOD .))