van dyke parks

info from an article / interview in melody maker 1974/01/04:

question: who were some of the big musical names that passed through the
mothers camp?
frank zappa: dr john auditioned for the mothers before we recorded "freak out".  he came down and when he heard the words to 'who are the brain police?' it scared him and he didn't think that he wanted to do it. jim guercio, now with chicago was in the group for a very short period of time in a
club called the trip, playing guitar, van dyke parks played electric harpsichord in and out. van dyke was not a reliable player. he didn't make it to rehearsal on time and things like that, and jim guercio, i can't remember how he left.