(Nov. 23, 1888 - Sept. 28, 1964) Harpo Marx was one of the Marx Brothers, a group of Vaudeville and Broadway theatre entertainers who later achieved fame as comedians in the Motion Picture industry. He was well known by his trademarks: he played the harp; he never talked during performances, although he often blew a horn or whistled to communicate with people; and he frequently used props.