2004 Tony Award winner Idina Menzel (Elphaba) performs the climax of Defying Gravity in San Francisco Wicked - Pre-Broadway Tryout - 2003/06/28 Wicked is property of NBC Universal Music and lyrics by Stephen Schwartz
@SwayingAndSweeping She actually did do the "solo" riff in many of her performances, all throughout the length of her Broadway run. She also did it about 90 percent of the time in London too. I guess it just depended on her mood/energy.
@degeorgetitanic Yeah, she kept that riff during the Broadway run, but cut it shortly after the show opened. I guess it proved to be way too difficult to perform 8 times a week.