Classical Hollywood cinema
The beginning of the sound era itself is ambiguously defined. To some, it began with "The Jazz Singer", which was released in 1927 and increased box-office profits for films, as sound was introduced to feature films. To others, the era began in 1929, when the silent age had definitively ended. Most Hollywood pictures from the late 1920s to 1960s adhered closely to a genre—Western, slapstick comedy, musical, animated cartoon, and biopic (biographical picture)—and the same creative teams often worked on films made by the same studio. For instance, Cedric Gibbons and Herbert Stothart always worked on MGM films; Alfred Newman worked at Twentieth Century Fox for twenty years; Cecil B. DeMille's films were almost all made at Paramount Pictures; and director Henry King's films were mostly made for Twentieth Century Fox. Similarly, actors were mostly contract players. Film historians and critics note that it took about a decade for films to adapt to sound and return to the level of artistic quality of the silents, which it did in the late 1930s.
Economy of California
With Thomas Edison's invention of the Kinetoscope (early movie camera) in 1894, California would become a leader when "talkies" were introduced in the sound film movie industry. The idea of combining motion pictures with recorded sound is nearly as old as film itself, but because of the technical challenges involved, synchronized dialogue was only made practical in the late 1920s with the perfection of the Audion amplifier tube and the introduction of the Vitaphone system. After the release of "The Jazz Singer" in 1927, "talkies" became more and more commonplace. Within a decade, popular widespread production of silent films had ceased. Cheap land, good year-round climate and large natural spaces prompted the growing film industry to begin migrating to Southern California in the early part of the 20th century. The film patent wars of the early 20th century actually led to the spread of film companies across the U.S. Many worked with equipment for which they did not own the patent rights, and thus filming in New York was "dangerous"; it was too close to Edison's company headquarters, and to his agents which the company sent out to seize "illegal" cameras. By 1912, most major film companies had set up movie production facilities in Southern California near or in Los Angeles because of the region's favorable year-round weather and the rapidly growing supply of "talent" both before and behind the cameras. Since the 1920s California continues to be a major U.S. center for motion-picture shows, television shows, cartoons, and related entertainment industries, especially in Hollywood and Burbank areas.