PBS
Pbs: From the Silent Era to Franchise Films: The Shattered Silence
A video that discusses the history of adding sounds to movies, the first movies with sound, and the Warner family. [7:18]
Crash Course
Crash Course Film History #10: Breaking the Silence
This video focuses on the breaking of silence in movies with the invention of sound on film and disc allowing for the synchronization of picture and sound. [9:36]