It's the Game of Thrones spin-off no-one saw coming – The Hound, Tormund, Ser Jorah and Beric teaming up as a musical outfit.

But GoT fans went wild after Kristofer Hivju (Tormund) posting clips of the quarter performing together between takes.

First, Hivju and Rory McCann (The Hound) debuted on Roger Whittaker's 'Yellow Bird', then the pair teamed with Iain Glen (Ser Jorah) and Richard Dormer (Beric) to perform the Tom Waits classic 'I Hope That I Don't Fall In Love With You'.

Related: 13 Game of Thrones stars' secret(-ish) musical pasts

Dormer – speaking to Digital Spy to promote his new BBC thriller Rellik – had no idea that the clip had gone viral.

"Really? Oh wow. I knew Kristof put something online... we just have fun," he said. "It's just us blowing off steam. A lot of the time we're sitting around waiting for hours, in the rain."

HBO

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Once we revealed that fans were now calling for a studio album from the so-called Brotherhood without Banjos, he laughed: "Well, we all have instruments now, so if I'm in the next season, we'll be popping down to the recording studio in Belfast!"

The odds of that happening are, of course, directly tied to Beric's survival, with Dormer's character (along with Hivju's Tormund) possibly meeting his end when the Night King destroyed The Wall.

HBO

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"The response was amazing," Dormer said. "Just a lot of people asking 'Are you still alive? Are Beric and Tormund still alive?' and I'm going, 'I can't tell you!'."

Maybe a tour of the Seven Kingdoms could keep the Brotherhood busy, since it looks like Game of Thrones' final season might be delayed all the way into 2019?

Rellik – a crime thriller, told in reverse – begins next Monday (September 11) at 9pm on BBC One.

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