Before the Grammys, it was revealed that Gaga would be performing with Metallica, who previously said they had "something very unique and special planned."
What resulted was a head-banger that made for one seriously fierce Lady Gaga performance, as she sported a Metallica tank and snarled into the microphone like a natural metal-head. But the same frustrations Adele experienced with sound issues earlier in the evening (and last year, too) were a consistent theme here, since members of Metallica's microphones didn't even seem to be on at the beginning of the performance. Gaga shook off the sound issues like a pro, though, and ended things by crowd-surfing and twirling on them haters, which may be the only appropriate way to end a somewhat awkward performance with dignity.
See a clip from the performance below: