Ulrich had nothing but praise for the "Judas" hitmaker during an interview with "L.A. Daily" on SiriusXM, reported Ace Showbiz.
"We thought let's not make this 'Gaga and Metallica' or 'you and us,' but let's make it all of us, the five of us together," Ulrich said, before adding, "Gaga was the fifth member of the band. It's not two different worlds, it's all of us together."
Ulrich also shared the backstory of how Gaga could be selected as their collaborator, citing her "creative spirit" as the main reason.
The drummer continued, "We talked internally about having a female collaborator to sing one of the songs for the new album... It came together super organic and really quick... she's very autonomous and independent and she makes her own decisions. She is the coolest, sweetest, most easygoing person you'll ever meet.