(S (S (BASENP (NNP Dryden)) (VP (VP (VP (VBD left) (BASENP (DT the) (NN band))) (PP (IN in) (BASENP (NN 1970)))) (S (VP (TO to) (VP (VB play) (PP (IN with) (NP (NP (BASENP (NNP New) (NNPS Riders)) (PP (IN of) (BASENP (NNP The) (NNP Purple) (NNP Sage)))) (COMMA ,) (NP (BASENP (DT a) (NN country) (NN rock) (NN band)) (VP (VBN formed) (PP (IN by) (NP (BASENP (NNS members)) (PP (IN of) (NP (DT the) (ADJP (NNP Grateful) (NNP Dead))))))))))))))) (PERIOD .))