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.