In the musical "Wicked", which character primarily sings "Defying Gravity"?

"Defying Gravity" is the signature song from the musical Wicked, composed by Stephen Schwartz, originally recorded by Idina Menzel and Kristin Chenoweth on May 10, 2003, and released on December 16, 2003. It is mostly a solo sung by the main character of the show, Elphaba (the Wicked Witch of the West), 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.

Elphaba Thropp is a fictional character in "Wicked: The Life and Times of the Wicked Witch of the West" by Gregory Maguire, as well as in the Broadway and West End adaptations, "Wicked".

In the original 1900 L. Frank Baum's book "The Wonderful Wizard of Oz", the Wicked Witch of the West is unnamed and little is explained about her life. Elphaba is modeled after the Witch portrayed by Margaret Hamilton in the classic 1939 film "The Wizard of Oz": green-skinned, clad entirely in black and wearing a tall peaked hat. Maguire formulated the name "Elphaba" from the phonetic pronunciation of Baum's initials L.F.B. In both adaptations, Elphaba is also called by several nicknames including Elphie, Fabala, Sister (Saint) Aelphaba, Auntie Witch, and Fae.