And I also play very different solos with Ghost than I do with Opeth." Both Forge and Åhlund are guitar players themselves which further thickened the stew of creative ideas on the album.

"He explains it, he doesn't play it," Fredrik summarises. And it's different to any way the guitarist has worked before. "I kind of love that," he admits. "It's a challenge because it's a different ...

Whatever he’s working on, one thing’s for certain: it’s going to play host to some killer guitar tones (and, in the case of Royal Blood, bass-emulating-guitar tones).

And it wasn't just any guitar — it was a well-known one used by some of the most revered artists of the 20th century. So it was more like getting ready for a gig at Madison Square Garden.