Actually it was 1927 where sound really came to play with the jazz singer, 1928 was the debut of another star with sound, Mickey Mouse in Steamboat Willie which was played alongside a film called Gang War, which is now considered Lost today since no footage from the film has ever resurfaced online
Bravo, Tim, another masterclass in technique and art history. I suggest your next project should be on Velasquez, the court painter to end ALL court painters.