The 1920s to the 1960s are often referred to as the Golden Age of Hollywood. During this period, the major film studios (e.g., MGM, Paramount, Warner Bros.) produced a vast number of iconic movies that continue to influence the industry today. Classics like "Casablanca" (1942), "The Wizard of Oz" (1939), and "Singin' in the Rain" (1952) remain beloved by audiences worldwide.