While there had been earlier experiments with sound, 'The Jazz Singer' (1927) was the first feature-length motion picture with synchronized dialogue sequences. It used the 'Vitaphone' sound-on-disc system. When Al Jolson spoke the famous line, 'Wait a minute, wait a minute, you ain't heard nothin' yet!' it signaled the death knell for silent cinema. Within two years, silent films were virtually extinct. This revolution destroyed the careers of many silent stars whose voices didn't match their screen personas or who had thick accents. It also forced theaters to spend millions of dollars to upgrade their equipment, and it necessitated the creation of 'soundstages' to keep out external noise, permanently changing the architecture of Hollywood studios.