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
Originally, Baum did not intend for "The Wonderful Wizard of Oz" to have any sequels, but it achieved a greater popularity than any of the other fairylands he created, including the land of Merryland in Baum's children's novel "Dot and Tot in Merryland", written a year later. Due to Oz's worldwide success, Baum decided to return to it four years after "The Wonderful Wizard of Oz" was published. For the next two decades, he described and expanded upon the land in the Oz Books, a series which introduced many fictional characters and creatures. Baum intended to end the series with the sixth Oz book "The Emerald City of Oz" (1910), in which Oz is forever sealed off and made invisible to the outside world, but this did not sit well with fans, and he quickly abandoned the idea, writing eight more successful Oz books, and even naming himself the "Royal Historian of Oz."