Photos and Audio: Tonight on GLEE- Lady Gaga, Green Day and More!

Tonight, May 15, FOX will air two back-to-back GLEE episodes, entitled 'Props' and 'Nationals'. As the countdown to graduation continues, the kids of New Directions prepare a high-concept routine for Nationals. When Tina (Jenna Ushkowitz) bumps her head, the world of New Directions is turned upside down in her eyes. Then, New Directions face off against Wade (Alex Newell) and Vocal Adrenaline at Nationals in Chicago, where they perform in front of celebrity judge Lindsay Lohan (guest-starring as herself).

Check out photos and full tracks from the episodes below, which include: 'We Are the Champions,' 'Good Riddance (Time of Your Life),' 'I Won't Give Up,' and more!

GLEE is a musical comedy about a group of eager and ambitious students who strive to outshine their singing competition to win Nationals while navigating the cruel halls of McKinley High. Since its debut, GLEE has become a bona fide cultural phenomenon, received prestigious honors including the Golden Globe and Peabody Award and singlehandedly made glee clubs cool again.

GLEE is produced by Ryan Murphy Television in association with 20th Century Fox Television. Ryan Murphy, Brad Falchuk and Ian Brennan are co-creators of the series. Murphy, Falchuk, Brennan and Dante di Loreto serve as executive producers.

Photo Credit: Adam Rose

Darren Criss

Harry Shum Jr., Damian McGinty

Matthew Morrison

Harry Shum Jr., Damian McGinty, Samuel Larsen, Lea Michele

Mark Salling

Vanessa Lengies, Samuel Larsen

Jenna Ushkowitz

Amber Riley, Chris Colfer, 

Jane Lynch

Dot-Marie Jones

Lea Michele

Jane Lynch,

Jane Lynch, Matthew Morrison

Matthew Morrison, Jayma Mays

Lindsay Lohan

Lindsay Lohan

Lindsay Lohan, Rex Lee