Musical theater (or musical theatre) is a kind of performance in a theater. A work of musical theater is called a musical. It uses acting, music, songs, and often dance. Some musicals (for example "Les Misérables") have only a few lines of dialogue. Everything else is sung. It is usually a mixture of speaking and song. Some well-known musicals are "West Side Story", "The Sound of Music", "Chicago," and "Oklahoma!".