Question

Who pioneered animated movies with his short feature, Steamboat Willie, in 1928? A. Aaron Copeland B. Al Jolson C. George Gershwin D. Walt Disney

Answer 1

Steamboat Willie was created by Walt Disney in a newly minted Walt Disney studies. The short black and white picture was the debut of Mikey Mouse, who was one of the most successful Disney characters. 
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Answer 2

D. Walt Disney 
" Steamboat Willie is a 1928 American animated short film directed by Walt Disney  and Ub lwerks . It was produced in black-and-white by Walt Disney Studios and was released by Celebrity Productions. The cartoon is considered the debut of Mickey Mouse  and his girlfriend Minnie, despite both the characters appearing several months earlier in a test screening of Plane Crazy. Steamboat Willie was the third of Mickey's films to be produced, but was the first to be distributed because Walt Disney had, having seen the Jazz Singer, committed himself to producing the first fully synchronized sound cartoon. "