Don Preston in a scene from „Uncle Meat“ – The Movie. This is so true as it was all these years ago … If you get your hands on the full movie watch/buy it! Sometimes the family trust allows public viewing. Hope they release the full movie to archive.org (one day)!
Alternative is here.
Uncle Meat (film)
Uncle Meat is a film written and directed by Frank Zappa, released directly to video in 1987. Principal photography having never been completed, the videocassette is a "making of" documentary showing rehearsals and background footage from 1968 and interviews with people involved with the uncompleted production.
Definition from Wikipedia – Uncle Meat (film)
Donald Ward Preston (born September 21, 1932) is an American jazz and rock keyboardist.
Definition from Wikipedia – Don Preston
Frank Vincent Zappa (December 21, 1940 – December 4, 1993) was an American musician, composer, activist and filmmaker.
Definition from Wikipedia – Frank Zappa