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Watch! Spoiler Clip of Blaine, Brittany, and Mike’s “You Should Be Dancing” in Glee Season 3, Episode 16: “Saturday Night Glee-ver” (VIDEO)

Blaine (Darren Criss), Mike (Harry Shum Jr.) and Brittany (Heather Morris) show off their awesome disco dance moves — and their high falsetto voices — in this glittery, '70s-tastic performance of "You Should Be Dancing" from Glee Season 3, Episode 16: “Saturday Night Glee-ver.”

Original Air Date: Tuesday, April 17, 2012, 8/7c on Fox