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'Glee' Bee Gees Songs And More: Watch To Disco Performances From 'Saturday Night Glee-ver'

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It's 1977 all over again when "Glee" takes on disco, particularly the Bee Gees and their legendary "Saturday Night Fever" tracks. From "Staying Alive" to "Night Fever," "Glee" is taking on all the classics in the appropriately titled "Saturday Night Glee-ver" episode (Tues., April 17, 8 p.m. ET on Fox).

What else can viewers expect besides Bee Gees tunes? "Disco, John Travolta, lots of glitter, rollerskating," Jenna Ushkowitz, who plays Tina, says of the episode in a new behind-the-scenes video.

Check out two performances below and click over to for the other songs.

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