An anthology film (also known as an omnibus film, package film, or portmanteau film) is a subgenre of films consisting of several different short films, often tied together by only a single theme, premise, or brief interlocking event (often a turning point). Sometimes each one is directed by a different director. These differ from "revue films" such as Paramount on Parade (1930)—which were common in Hollywood in the early sound film era to show off their stars and related vaudeville-style acts—composite films, and compilation films.