An anthology film is a single film consisting of three or more shorter films, each complete in itself and distinguished from the other, though frequently tied together by a single theme, premise, or author. Sometimes each one is directed by a different director or written by a different author, or may even have been made at different times or in different countries. Anthology films are distinguished from "revue films" such as Paramount on Parade (1930)—which were common in Hollywood in the early decades of sound film, composite films, and compilation films.