Marx Brothers appeared, sometimes with Chico and Zeppo caricatured, in cartoons starring Mickey Mouse, Flip the Frog and others. In the "Airwolf" episode 'Condemned', four anti-virus formulae for a deadly plague were named after the four Marx Brothers. In "All in the Family", Rob Reiner often did imitations of Groucho, and Sally Struthers dressed as Harpo in one episode in which she (as Gloria Stivic) and Rob (as Mike Stivic) were going to a Marx Brothers film festival, with Reiner dressing as Groucho. Gabe Kaplan did many Groucho imitations on his sit-com "Welcome Back, Kotter" and Robert Hegyes sometimes imitated both Chico
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