Apple Inc. added Metro-Goldwyn- Mayer Inc. movies for sale on the iTunes Web site, offering customers such classic titles as “The Great Train Robbery” and modern hits like “Rocky.” MGM, owner of the world’s largest film library, will sell about 100 of its movies on iTunes, Derick Mains, a spokesman for Cupertino, California-based Apple said today in an interview. Films from MGM, the fourth studio to sign on since Apple started the movie-download service eight months ago, boost the iTunes catalog to more than 500 films, Apple said in a statement. Except for Walt Disney Co., where Apple Chief Executive… Read more »