 Only two songs were written especially for the film: "Moses  Supposes" was written by Roger Edens (qv), Betty Comden (qv) and  Adolph Green (qv); "Make Em Laugh" was written by  Arthur Freed (qv) and Nacio Herb Brown (qv) especially for  Donald OConnor (qv). Its generally agreed that they stole the  melody almost exactly from Cole Porter (qv)s "Be a Clown".  Irving Berlin (I) (qv) was visiting the set one day when he heard  a playback of "Make Em Laugh". When Berlin asked whose song that  was, Freed quickly changed the subject.