also neat and trim". In February 1928, Disney hoped to negotiate a larger fee for producing the Oswald series, but found Mintz wanting to reduce the payments. Mintz had also persuaded many of the artists involved to work directly for him, including Harman, Ising, Carman Maxwell and Friz Freleng. Disney also found out that Universal owned the intellectual property rights to Oswald. Mintz threatened to start his own studio and produce the series himself if Disney refused to accept the reductions. Disney declined Mintz's ultimatum and lost most of his animation staff, except Iwerks, who chose to remain with him. Creation of Mickey Mouse to the first Academy Awards: 1928–1933 To replace Oswald, Disney and Iwerks developed Mickey Mouse, possibly inspired by a pet mouse that Disney had adopted while working in his Laugh-O-Gram studio, although the origins of the character are unclear. Disney's original choice of name was Mortimer Mouse, but his wife Lillian thought it too pompous, and suggested Mickey instead. Iwerks revised Disney's provisional sketches to make the character easier to animate. Disney, who had begun to distance himself from the animation process, provided Mickey's voice until 1947. In the words of one Disney employee, "Ub designed Mickey's physical appearance, but Walt gave him his soul." Mickey Mouse first appeared in May 1928 as a single test screening of the short Plane Crazy, but it, and the second feature, The Gallopin' Gaucho, failed to find a distributor. Following the 1927 sensation The Jazz Singer, Disney used synchronized sound on the third short, Steamboat Willie, to create the first post-produced sound cartoon. After the animation was complete, Disney signed a contract with the former executive of Universal Pictures, Pat Powers, to use the "Powers Cinephone" recording system; Cinephone became the new distributor for Disney's early sound cartoons, which soon became popular. To improve the quality of the music, Disney hired the professional composer and arranger Carl Stalling, on whose suggestion the Silly Symphony series was developed, providing stories through the use of music; the first in the series, The Skeleton Dance (1929), was drawn and animated entirely by Iwerks. Also hired at this time were several local artists, some of whom stayed with the company as core animators; the group later became known as the Nine Old Men. Both the Mickey Mouse and Silly Symphonies series were successful, but Disney and his brother felt they were not receiving