The Wizard of Oz (1902 musical)
The Wizard of Oz was a 1902 musical extravaganza based on "The Wonderful Wizard of Oz" by L. Frank Baum, which was originally published in 1900. Much of the original music was by Paul Tietjens and has been mostly forgotten, although it was still well-remembered and in discussion at MGM in 1939 when the classic film version of the story was made. Although Baum is the credited bookwriter, Glen MacDonough was hired on as jokewriter after Baum had finished the script.
Land of Oz
A legend of uncertain validity is that when relating bedtime stories (the earliest form of the Oz books) Baum was asked by his niece, Ramona Baxter Bowden, the name of the magical land. He glanced at a nearby filing cabinet, which had three drawers, labeled A–G, H–N, and O–Z. Thus he named the land Oz. This story was first told in 1903, but his wife always insisted that the part about the filing cabinet was not true. In "Dorothy and the Wizard in Oz", the name is translated as "great and good". It has also been speculated that Oz was named after the abbreviation for ounce, in the theory that Oz is an allegory for the populist struggle against the illusion (the wizard) of the gold standard.