The episode, which airs Dec. 9 at 9 PM ET, will include cast versions of "And I Am Telling You I'm Not Going" from Dreamgirls and “Don’t Rain On My Parade" from Funny Girl as well as The Rolling Stones’ “You Can’t Always Get What You Want” and Kelly Clarkson’s “My Life Would Suck Without You.” (These songs are now available for downloading on iTunes.)

In the new episode, press notes state, "Sectionals is finally here for the Glee Club, but when QUINN’s (Dianna Agron) secret unravels, the club may not be able to recover in time to compete. Meanwhile, SUE’s (Jane Lynch) scheming hits an all-time high, and with EMMA (Jayma Mays) and KEN’s (guest star Patrick Gallagher) marriage looming, WILL (Matthew Morrison) makes a decision that could change his life forever. "

"Glee " will return with new episodes April 13, 2010.

Here are the songs as posted on Youtube:

And I Am Telling You I'm Not Going:

Don't Rain On My Parade:

My Life Would Suck Without You: