Mickey Mouse
Audiences at the time of "Steamboat Willie"'s release were reportedly impressed by the use of sound for comedic purposes. Sound films or "talkies" were still considered innovative. The first feature-length movie with dialogue sequences, "The Jazz Singer" starring Al Jolson, was released on October 6, 1927. Within a year of its success, most United States movie theaters had installed sound film equipment. Walt Disney apparently intended to take advantage of this new trend and, arguably, managed to succeed. Most other cartoon studios were still producing silent products and so were unable to effectively act as competition to Disney. As a result, Mickey would soon become the most prominent animated character of the time. Walt Disney soon worked on adding sound to both "Plane Crazy" and "The Gallopin' Gaucho" (which had originally been silent releases) and their new release added to Mickey's success and popularity. A fourth Mickey short, "The Barn Dance", was also put into production; however, Mickey does not actually speak until "The Karnival Kid" in 1929 when his first spoken words were "Hot dogs, Hot dogs!" After "Steamboat Willie" was released, Mickey became a close competitor to Felix the Cat, and his popularity would grow as he was continuously featured in sound cartoons. By 1929, Felix would lose popularity among theater audiences, and Pat Sullivan decided to produce all future Felix cartoons in sound as a result. Unfortunately, audiences did not respond well to Felix's transition to sound and by 1930, Felix had faded from the screen.
Musical film
Musical short films were made by Lee de Forest in 1923–24. Beginning in 1926, thousands of Vitaphone shorts were made, many featuring bands, vocalists, and dancers. The earliest feature-length films with synchronized sound had only a soundtrack of music and occasional sound effects that played while the actors portrayed their characters just as they did in silent films: without audible dialogue. "The Jazz Singer", released in 1927 by Warner Brothers, was the first to include an audio track including non-diegetic music and diegetic music, but it had only a short sequence of spoken dialogue. This feature-length film was also a musical, featuring Al Jolson singing "Dirty Hands, Dirty Face", "Toot, Toot, Tootsie", "Blue Skies", and "My Mammy". Historian Scott Eyman wrote, "As the film ended and applause grew with the houselights, Sam Goldwyn's wife Frances looked around at the celebrities in the crowd. She saw 'terror in all their faces', she said, as if they knew that 'the game they had been playing for years was finally over'." Still, only isolated sequences featured "live" sound; most of the film had only a synchronous musical score. In 1928, Warner Brothers followed this up with another Jolson part-talkie, "The Singing Fool", which was a blockbuster hit. Theaters scrambled to install the new sound equipment and to hire Broadway composers to write musicals for the screen. The first all-talking feature, "Lights of New York", included a musical sequence in a night club. The enthusiasm of audiences was so great that in less than a year all the major studios were making sound pictures exclusively. "The Broadway Melody" (1929) had a show-biz plot about two sisters competing for a charming song-and-dance man. Advertised by MGM as the first "All-Talking, All-Singing, All-Dancing" feature film, it was a hit and won the Academy Award for Best Picture for 1929. There was a rush by the studios to hire talent from the stage to star in lavishly filmed versions of Broadway hits. "The Love Parade" (Paramount 1929) starred Maurice Chevalier and newcomer Jeanette MacDonald, written by Broadway veteran Guy Bolton.