Copyright status of The Wizard of Oz and related works in the United States
"The Wonderful Wizard of Oz" was published in 1900, and was the first to enter the public domain in "1956". This allowed Reilly & Lee, the publisher of all the other Oz books (as well as Baum's other books) to issue their own edition of "The Wizard of Oz", which had previously been published by George M. Hill Company and later by the Bobbs Merill Company after Hill went bankrupt..
The Wonderful Wizard of Oz (musical)
The Wonderful Wizard of Oz is a musical play based on the novel of the same title by L. Frank Baum that premiered at the Toronto Civic Light Opera Company in 2000. The lyrics are by James Patrick Doyle and Joe Cascone, the music is by Doyle and the book is by Cascone who also directed. This company describes the show as the most requested in their repertory and revived it in 2002 and again in 2010.