Claflin didn't have much musical experience before being cast as The Six's frontman Billy Dunne, so he had to learn how to sing and play guitar for the role. "I was fucking petrified," Claflin told Variety about beginning his music lessons. "Right from the fucking beginning, sh*t scared. I remember my first guitar lesson, going, 'What the hell? How am I going to be singing whilst doing this, whilst also moving around?'"
The cast was initially supposed to receive five weeks of musical training in person, but due to the pandemic, their lessons lasted over a year and a half, and they were moved onto Zoom. "They say everything happens for a reason," Claflin said, explaining that those virtual lessons helped the cast bond as a band.
To get into the role of Billy, the actor also told the publication that he studied the White Denim's lead singer James Petralli's voice, which he called "f*cking incredible."
"I don't do a very good impression of him at all. But that was sort of my guide," Claflin said. "And then I got more confident with it and started playing around with my own style."