Wicked (ISBN 0-06-098710-3), or Wicked: The Life and Times of the Wicked Witch of the West, is a parallel novel by Gregory Maguire. Based upon the writings of L. Frank Baum, it is a revisionist look at the land and characters of Oz, best known from Baum's 1900 novel The Wonderful Wizard of Oz and the 1939 film The Wizard of Oz.
Wicked is a musical that opened on Broadway at the George Gershwin Theatre on October 30, 2003.http://www.ibdb.com/production.asp?ID=13485 It is touted as the untold story of the witches of Oz and is loosely based on the best selling novel Wicked: The Life and Times of the Wicked Witch of the West by Gregory Maguire. The musical features music and lyrics by Stephen Schwartz and a book by Winnie Holzman.