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.
Foley (filmmaking)
What is now called Foley originated as sound effects added to live broadcasts of radio drama from radio studios around the world in the early 1920s. Phonograph recordings of the era were not of sufficient quality or flexibility to faithfully reproduce most sound effects on cue, so a sound effects person had to create all sounds for radio plays live. Jack Donovan Foley started working with Universal Studios in 1914 during the silent movie era. When Warner studios released "The Jazz Singer", its first film to include sound, Universal knew it needed to stay competitive and called for any employees who had radio experience to come forward. Foley became part of the sound crew that turned Universal's then-upcoming "silent" musical "Show Boat" into a musical. Because microphones of the time could not pick up more than dialogue, other sounds had to be added in after the film was shot. Foley and his small crew projected the film on a screen while recording a single track of audio that captured their live sound effects. Their timing had to be perfect, so that footsteps and closing doors synchronized with the actors' motions in the film. Jack Foley created sounds for films until his death in 1967. His basic methods are still used today.