Martin Lickert's Story - Frank Zappa & the Mothers

Martin: I just went out to get some cigarettes for him one day and came back and walked into the dressing room and there's Frank and the rest of the Mothers and, uh, Ringo, the other people, and I walked in the room and they all went, "Yeah!" And, "Yeah what?" You know, "Would, would you like to try Jeff's part?" You know, so I just tried that, and it seemed to work okay 
Interviewer: Mm-mmh . . . 
Martin: So Frank said, "Would, you can play, play bass, you can try play into the group as well"
FZ: So he took the script and he read it and it sounded good and then just quite by accident, we found out that he was a bass player and that he's good for the part, is, uh, quite professional on screen and as a bass player he's not astonishing but, uh, he can make the parts