It’s one of the most recognizable sounds in the world: A blasting roar that could rattle a jungle. For film lovers, it means one thing: a Metro-Goldwyn-Mayer movie is about to roll. For decades, MGM ...

Two film technicians with Metro-Goldwyn-Mayer get ready to record the roar of Jackie, the second ‘Leo the Lion,’ in 1928. His trademark roar appeared at the start of all MGM movies until 1956. Parrish ...