2012, Christoper Zara, Tortured Artists: From Picasso and Monroe to Warhol and Winehouse, the Twisted Secrets of the Worlds Most Creative Minds'', part 1, chapter 1, (gbooks):
On October 6, 1927, Warner Bros. released The Jazz Singer, the first sound-synched feature film, prompting a technological shift of unprecedented speed and unstoppable force. Within two years, nearly every studio release was a talkie.