Ulrich tells Rolling Stone, "I got down to this studio - and within half an hour I'm sitting in their room and it's Lemmy, Phil Taylor and Eddie Clark. It was just them and me, and they're writing songs for their next album.

"I remember they were talking about this new song called Iron Fist. This is the biggest band in England, and I'm just sitting there with them in the f***ing rehearsal room writing songs for their next record. Just put that in f***ing perspective."

Ulrich continues: "There was this openness to let people into their inner circle, and it motivated me. I had met this kid, James Hetfield, about six months before - I could tell he was a super-cool guy, but nothing much came out of that interaction.

"Later in the week after I got back, I called him up and said, 'We've got to form a band together. I just hung out with Motorhead. I'm feeling it, this otherworldly calling.'