The Marx Brothers take on high society and the opera world to bring two lovers together. A sly business manager and two wacky friends of two opera singers help them achieve success while humiliating their stuffy and snobbish enemies.

'A Night at the Opera' is celebrated for its iconic comedic routines and the Marx Brothers' unique blend of verbal and physical comedy. Groucho's wit, Chico's musical talents, and Harpo's slapstick humor are highlighted. Margaret Dumont's role and musical numbers add entertainment value, though some criticize their integration. The film is praised for its production quality and subversion of high society norms. However, a perceived shift towards more structured comedy marks the beginning of a decline in their later works.