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.
Film score
Before the age of recorded sound in motion pictures, efforts were taken to provide suitable music for films, usually through the services of an in-house pianist or organist, and, in some cases, entire orchestras, typically given cue sheets as a guide. A pianist was present to perform at the Lumiere brothers' first film screening in 1895. In 1914, The Oz Film Manufacturing Company sent full-length scores by Louis F. Gottschalk for their films. Other examples of this include Victor Herbert's score in 1915 to "The Fall of a Nation" (a sequel to "The Birth of a Nation") and Camille Saint-Saëns' music for "The Assassination of the Duke of Guise" in 1908. It was preceded by Nathaniel D. Mann's score for "The Fairylogue and Radio-Plays" by four months, but that was a mixture of interrelated stage and film performance in the tradition of old magic lantern shows. Most accompaniments at this time, these examples notwithstanding, comprised pieces by famous composers, also including studies. These were often used to form catalogues of photoplay music, which had different subsections broken down by 'mood' and genre: dark, sad, suspense, action, chase, etc.