How did movies change in the late 1920s?

Starting in 1927 with the movie The Jazz Singer, movies had sound incorporated into them.  Before this, all movies were silent.  They conveyed stories with facial expressions and cards which aired between scenes.  There was often an organist or a pianist who worked for the theater who supplied the background music.  The "talkies" as they were known, revolutionized film.  Actors were cast based on the quality of their voices—many actors from the silent era lost work because their voices did not translate to the big screen.  Movies incorporated music as well, and soon the musical would become a Hollywood staple.  People would also get their news from the movies, and newsreels soon competed with newspapers for allowing people greater access to events unfolding around the world.  Cartoons before the movies became popular with viewers young and old; Steamboat Willie, starring a whistling Mickey Mouse, was a hit in the late 1920s. Walt Disney soon branched out into longer films with Snow White being the first full-length animated feature.  It is hard to imagine any of this happening without the invention of the "talkie," because audiences needed to hear dialogue in order to maintain their attention for long movies.