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Once the lights come back on at McKinley High, the Glee club celebrates with an a cappella rendition of "For the Longest Time."

GLEE: The Glee club performs in the "Lights Out" episode of GLEE airing Thursday, April 25 (9:00-10:00 PM ET/PT) on FOX. ©2013 Fox Broadcasting Co. Pictured L-R: Jenna Ushkowitz, Alex Newell, Chord Overstreet, Becca Tobin, Kevin McHale, Melissa Benoist, Blake Jenner, Jacob Artist and Darren Criss. CR: Eddy Chen/FOX Eddy Chen/FOX
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