These works combine a musical score and a libretto, or text, and are typically accompanied by an orchestra. The live performances incorporate stage acting, costumes, scenery, and often dancing. Actors may work in a variety of settings, including theater, film, television, and radio. Some actors work exclusively in one medium, while others work across multiple mediums. They may also work on stage productions, commercials, or voiceovers for animated films or video games. Acting requires a combination of talent, training, and experience, as well as a willingness to work long and irregular hours.