"Defying Gravity" is the signature song from the musical Wicked, composed by Stephen Schwartz, originally recorded by Idina Menzel and Kristin Chenoweth on November 10, 2003, and released on December 16, 2003. It is mostly a solo sung by the main character of the show, Elphaba, with two small duets at the beginning and in the middle of the song between Elphaba and her friend Glinda, and a chorus part at the end in which the citizens of Oz sing.

Wicked is a musical with music and lyrics by Stephen Schwartz and a book by Winnie Holzman. It is a loose adaptation of the 1995 Gregory Maguire novel Wicked: The Life and Times of the Wicked Witch of the West, which is in turn based on L. Frank Baum's 1900 novel The Wonderful Wizard of Oz and its 1939 Metro-Goldwyn-Mayer film adaptation.