As one of the unlikelier pairings of the evening, Gaga and Metallica didn't let their disparate genres keep them from synthesizing a fiery performance. Gaga and Metallica's James Hetfield traded off lead vocals while a ragtag assortment of punk kids moshed with them onstage throughout Metallica's song "Moth Into Flame."
Gaga got in on some of the moshing, too. She even stage-dived into the front of the crowd and surfed across them on her back. Trust falls aren't just for theater kids.