"Puttin' On the Ritz" is a song written by Irving Berlin. He wrote it in May 1927 and first published it on December 2, 1929. It was registered as an unpublished song August 24, 1927 and again on July 27, 1928. It was introduced by Harry Richman and chorus in the musical film Puttin' On the Ritz (1930). According to The Complete Lyrics of Irving Berlin, this was the first song in film to be sung by an interracial ensemble. The title derives from the slang expression "to put on the Ritz", meaning to dress very fashionably. This expression was itself inspired by the opulent Ritz Hotel in London.