Trujillo was asked how the new songs were sounding and he replied, "We're just blueprinting everything right now. There are a lot of ideas, a lot of song bodies, you gotta go through the process. For me personally I'm really excited about what we've been able to jam out.

"I don't like to make predictions, but I'd like to think - at least for me - that I'm really happy with what's happening instrumentally. So let's see how that journey continues.

"Writing a Metallica song is a journey and a process, and it takes time. But that's what's special about it. Metallica likes to nurture a song, nurture an arrangement."