When filming has finished, an editor puts the moving pictures together in a way that tells the whole story within a set amount of time. Audio engineers and sound engineers record music and singing and join it with the moving pictures. When the movie is done, many copies of the movie are made by movie labs and put onto film reels. Then the reels are sent to cinemas. An electric machine called a projector shines a very bright light through the film, and people sitting in a dark room see it on a big screen.