Who provided the voices for Mickey and Minnie Mouse in the 1928 animated film 'Steamboat Willie'?

Steamboat Willie is a 1928 American animated short film directed by Walt Disney and Ub Iwerks. It was produced in black-and-white by Walt Disney Studios and was released by Celebrity Productions.

Music for Steamboat Willie was arranged by Wilfred Jackson and Bert Lewis, and included the songs "Steamboat Bill," a composition popularized by baritone Arthur Collins during the 1910s, and "Turkey in the Straw" , a composition popularized within minstrelsy during the 19th century. The title of the film is a parody of the Buster Keaton film Steamboat Bill Jr. (1928), itself a reference to the song by Collins. Walt Disney performed all of the voices in the film, although there is little intelligible dialogue.