The song 'I'm Not that Girl' is from which musical?

"I'm Not that Girl" is a song from the musical Wicked. It is based on the novel Wicked: The Life and Times of the Wicked Witch of the West by Gregory Maguire, composed by Stephen Schwartz. Originally recorded by Idina Menzel (original song) and Kristin Chenoweth (reprise) on November 10, 2003, and released on December 16, 2003. It is a solo sung by the main character of the show, Elphaba Thropp (the future Wicked Witch of the West in The Wonderful Wizard of Oz) in the first act and Glinda in the reprise in the second act.

The song is performed midway through the first act. During the song, Elphaba expresses her love for the Winkie prince Fiyero, the most popular boy at Shiz and Glinda's boyfriend. She accepts that she knows that nothing can ever happen between them, as she 'wasn't born for the rose and the pearl', and is an unpopular girl with green skin. She also mentions that Fiyero has feelings for her, though this was unconfirmed. In act two Glinda reprised it about Elphaba when Fiyero leaves with her.