Frank Zappa mentions drummer Marty Seven in a radio interview from 1981.
transcription of the interview:
Frank: The drummer auditions are closed right now because I just hired a guy from Chicago. His name is Marty Seven. As a matter of fact, he's probably there visiting in Chicago with his parents right now... because he was out here... He was living in Boston, he came out, he tried out, he got the job and then moved all of his stuff out to California and then went back to visit with his parents for a week. So he may be back there right now so if he's there, Hi Marty, how you doing?
(from the Zappateers Forum)