Marx Brothers made a guest appearance to introduce the "Tonight Show's" new host, Johnny Carson. Around 1960, the acclaimed director Billy Wilder considered writing and directing a new Marx Brothers film. Tentatively titled "A Day at the U.N.", it was to be a comedy of international intrigue set around the United Nations building in New York. Wilder had discussions with Groucho and Gummo, but the project was put on hold because of Harpo's ill-health and abandoned when Chico died in 1961. He was 74. Three years later, on September 28, 1964, Harpo died at the age of 75 of a heart attack
Groucho Marx up his hands and replying, "Don't shoot me! I'm only the piano player!" was so amusing that Elton John reused it as the title of a 1973 album. An added Marx homage was that a poster for the Marx Brothers' movie "Go West" was included on the cover art. Two albums by British rock band Queen, "A Night at the Opera" (1975) and "A Day at the Races" (1976), are named after Marx Brothers films. In March 1977, Groucho invited Queen to visit him in his Los Angeles home; there they performed "'39" a cappella. A long-running ad campaign for