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Wilfred Jackson (January 24, 1906 – August 7, 1988) was an American animator, arranger, composer and director best known for his work on the Mickey Mouse and Silly Symphonies series of cartoons and the Night on Bald Mountain/Ave Maria segment of Fantasia from Walt Disney Productions. He was also instrumental in developing the system with which Disney added music and sound to Steamboat Willie, the first Mickey Mouse cartoon. Wikipedia