Steamboat Willie - Wikipedia

On July 29, 1928, test footage was first created for Walt Disney's "Steamboat Willie" with Mickey Mouse. From the article:

"The production of Steamboat Willie took place between July and September 1928 with an estimated budget of $4,986.[3] There was initially some doubt among the animators that a sound cartoon would appear believable enough, so before a soundtrack was produced, Disney arranged for a screening of the film to a test audience with live sound to accompany it.[11] This screening took place on July 29 with Steamboat Willie only partly finished. The audience sat in a room adjoining Walt's office. Roy placed the movie projector outdoors and the film was projected through a window so that the sound of the projector would not interfere with the live sound. Ub Iwerks set up a bedsheet behind the movie screen behind which he placed a microphone connected to speakers where the audience would sit. The live sound was produced from behind the bedsheet. Wilfred Jackson played the music on a mouth organ, Ub Iwerks banged on pots and pans for the percussion segment, and Johnny Cannon provided sound effects with various devices, including slide whistles and spittoons for bells. Walt himself provided what little dialogue there was to the film, mostly grunts, laughs, and squawks. After several practices, they were ready for the audience, which consisted of Disney employees and their wives.

The response of the audience was extremely positive, and it gave Walt the confidence to move forward and complete the film. He said later in recalling this first viewing, "The effect on our little audience was nothing less than electric. They responded almost instinctively to this union of sound and motion. I thought they were kidding me. So they put me in the audience and ran the action again. It was terrible, but it was wonderful! And it was something new!" Iwerks said, "I've never been so thrilled in my life. Nothing since has ever equaled it."[12]

Walt traveled to New York City to hire a company to produce the sound system. He eventually settled on Pat Powers's Cinephone system, created by Powers using an updated version of Lee De Forest's Phonofilm system without giving De Forest any credit, a decision he would later regret.

The music in the final soundtrack was performed by the Green Brothers Novelty Band and was conducted by Carl Edouarde. The brothers Joe and Lew Green from the band also assisted in timing the music to the film. The first attempt to synchronize the recording with the film, done on September 15, 1928, was a disaster.[13] Disney had to sell his Moon roadster in order to finance a second recording. This was a success with the addition of a filmed bouncing ball to keep the tempo."