Monkey Business

from Kurt Vonnegut's "Breakfast of Champions", published in 1973:

"[Kilgore Trout, the science fiction writer] wrote a story one time about an optimistic chimpanzee who became President of the United States. He called it 'Hail to the Chief.'

The chimpanzee wore a little blue blazer with brass buttons, and with the seal of the President of the United States sewed to the breast pocket....Everywhere he went, bands would play 'Hail to the Chief.' The chimpanzee loved it. He would bounce up and down."

Another golden nugget from The Smirking Chimp…