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Metallica’s James Hetfield Was ‘Livid’ Over Grammys Glitches, Lars Ulrich Says (Video)

”I haven’t seen him like that in 20 years,“ drummer tells James Corden

Enter mad man.

Metallica drummer Lars Ulrich appeared on “The Late Late Show With James Corden” on Tuesday night, revealing that the band’s frontman, James Hetfield, was “livid” over their glitch-damaged duet with Lady Gaga at Sunday’s Grammy Awards.

“I haven’t seen him like that in 20 years,” the drummer said of Hetfield’s mood backstage after the performance. “I mean, he was livid. I mean, he’s aged really well and he’s a pretty chill guy, but the first five or 10 minutes in that dressing room was not a lot of fun.”

“But like they say, the show must go on, and we fought through it,” Ulrich added.

The group’s duet with Lady Gaga at the Grammys was marred by technical difficulties, including a microphone snafu.

On Tuesday, Ulrich characterized the performance as a “clusterf—,” but noted that the chaos added to the energy of the show.

“From where I was sitting it was so chaotic — you know, firewalls and dancers, and James’ mic not working for the first verse — I mean, the whole thing was such a clusterf—,” Ulrich recalled.

“There was just this totally energetic, crazy — it was just energy and excitement and nuttiness,” Ulrich enthused. “So her [Gaga] right in my face just added to the whole exhilarating energy that was happening for those five minutes. it was awesome.”

Watch Ulrich dish on Hetfield’s anger in the video above.