*January — MGM announces that Judy Garland would be cast in the role of "Dorothy" in the upcoming Wizard of Oz motion picture. Ray Bolger is cast as the "Tinman" and Buddy Ebsen is cast as the "Scarecrow". At Bolger's insistence, the roles are switched between the two actors. MGM announces Bert Lahr has been cast as the "Cowardly Lion" on July 25. *April 5 — Noel Langley completes the first script for The Wizard of Oz. *May 7 — Lyricist Edgar Yipsel Harburg and composer, Harold Arlen, begin work on the musical score for The Wizard of Oz. *October 13 — Filming starts on The Wizard of Oz. *October 21 — Buddy Ebsen suffers from a near fatal allergic reaction to the aluminum dust used in his "Tinman" make-up on the set of The Wizard of Oz. Ebsen is replaced by Jack Haley. *December 23 — Margaret Hamilton is severely burned during a mishap on the set of The Wizard of Oz. Hamilton, who was cast in the role of the "Wicked Witch", left the film for six weeks.
