In 1920's the time when Walt finished making his Alice Comedies after four year, as his company started to develop by pushing the visual bounds as well with studio finances.He later decided to move onto all cartoon serise in 1927 where he created a character named Oswald the Lucky Rabbit.Within a year since he made 26 Oswald cartoon but need additional money by borrowing from George Winkler for the second time under Disney's name by taking over the studio without Disney.
As Walt had to came up with the idea of a new character with his chief animator Ub Iwerks before Iweks received the letter from Disney.
Since Dinsey designed an idea of a mouse by attempting to use a name Mortimer,but the time his wife Lily came up with the idea the name Mickey.And so the star was later born.As Iwerk animated two Mickey Mouse cartoon which were used from his first idea inspired by Oswald the Lucky Rabbit.By later replacing Oswald the Lucky Rabbit. When Walt decided that his studio should make the first sound cartoon. Which the studio poured all the resource into the third making of the mickey mouse cartoon. That later Mickey Mouse became a sensation hit around the world.Which helped the financial success from the basis of the Disney's empire.As it remain to be mickey that became the studio icon logo.
George Winkler: Walt Disney's Steamboat Willie (1928) was the first cartoon animation that produced a soundtrack of music from sound effect.