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1.
A' Capella groups - normally men - that perform Lady Gaga songs.
On The Rocks the University of Oregon's male a cappella group recently performed Lady Gaga’s ‘Bad Romance'

Pokerface Gaga'pella
by Johnny Yuta May 11, 2010
 
2.
Lady Gaga covers done acapella.
Tina: Did you see this awesome Gaga cover?

Lucy: It's the best gagapella I've heard of Bad Romance.
by Anneshine May 19, 2010