The 100th episode of the hit Fox musical series "Glee" will air March 18 and feature original New Directions members and a guest appearance from Tony Award winner Kristin Chenoweth. Listen to Amber Riley, Lea Michele and Chris Colfer perform the showstopping Act I finale of Wicked, "Defying Gravity," from the episode.
SOURCE: Playbill at 05:10PM on March 17, 2014