Musicals mostly take the stage musical style, in terms of performing to an audience, into a film environment. For a movie musical, the musical star will perform in a knowing way to the camera. In a non-musical film, an actor or actress will rarely look directly into the camera, but, for a musical, this is normal, and is seen as a way of engaging the audience. A musical star is expected to give an all-round performance, which often involves singing, dancing and acting. A non-musical actor or actress is expected to just act.
