Asked to describe his colleagues, Trujillo tells Lucas H Gordon: "They're all wonderful in their own way - they're all very different and that's what's interesting about Metallica as a band."

Of drummer Lars Ulrich he says: "You're dealing with a European who's extremely liberal and incredibly intelligent; a really different mindset from all of us because of the way he was raised."

He describes frontman James Hetfield as "the musical talent in the band for sure," adding: "but at the same time he's a pretty sensitive personality. He's got a strong exterior and he's extremely loyal, and powerful in that way. I learned so much from him as a person and through the music."