The early 1930’s saw an explosion of popularity and “Mickey Mouse consciousness” for Walt Disney’s character. First appearing to a general public with the release of Steamboat Willie on November 18, 1928, Mickey Mouse would become one of the most recognizable cartoon characters ever in just a few short years. Early Mickey cartoons, directed by Walt Disney and Ub Iwerks, impressed audiences with innovative use of sound for comedic effect by synchronizing the actions of the character with the music and audio (talkies had just begun to gain commercial viability and popular appeal).
Отсюда:
https://blogs.princeton.edu/cotsen/2019/12/merry-christmas-mickey-mouse-a-1934-disney-merchandise-promotional-book-2/