Jesse Fuller wrote The Monkey and the Engineer. A song covered by many musicians, including the Grateful Dead, and more recently Dave Rawlings. He invented that contraption next to him named the "fotdella".
From Wikipedia: The name "fotdella" was given to the instrument by Fuller's wife, who
took to calling it a "foot-diller" (as in the then-current expression,
"killer-diller", meaning exceedingly good); later, it became shortened
to just fotdella.