STAGE TUBE: GLEE Celebrates 100th Episode Tonight- An Encore Flashback!

On tonight's landmark episode of Glee titled "100", current and past members of New Directions reunite for one final assignment - to reinvent their favorite performances. But these new versions of the series' most iconic tracks should not be seen as goodbye to Glee club. On the contrary, they are celebrations of what the club has meant to each and every member. CLICK HERE to check out BroadwayWorld's world premiere audio of "Defying Gravity", as it will be performed tonight by Amber Riley, Lea Michele and Chris Colfer. Don't miss the all-new '100' episode of Glee airing tonight, March 18th on FOX!

Many Glee alums will return for the special episode, including: Gwyneth Paltrow, Kristin Chenoweth, Amber Riley, Chace Crawford, Dianna Agron, Harry Shum Jr., Heather Morris, Lauren Potter, and Mark Salling.

As a part of the special episode, Glee fans had the opportunity to participate in the "GLEE 100th GLEEKS CHOICE: You Vote. The Top 10 fan-chosen Glee songs from the past will be re-mixed and performed by the current members of New Directions in the milestone 100th episode. The episode will focus on McKinley High's latest batch of seniors as they approach graduation and reminisce about their most memorable moments, while singing new versions of these iconic tracks.

To hold you over for tonight's encores, BroadwayWorld brings you a roundup of the songs as they were originally performed in the show's earlier seasons. Below, check out a preview for the episode, as well as "Defying Gravity," "Valerie," "Toxic," "Keep Holding On" and "Raise Your Glass."