New York, May 8 : It’s the morning after the Game of Thrones Season Eight premiere in Manhattan and Joe Dempsie is dragging from the party. He's also jetlagged, having flown in from England for the April unveiling of the HBO blockbuster. But as he pulls his smart phone from his back pocket, he perks up as he taps through to YouTube.

“This video is amazing. It's called Ode to Joe. Oh yeah. It's here. Do you want to see it?” he asks with a conspiratorial smile, scooting forward on the couch and turning his phone to face me. “Come on 4G.”

The video starts with a young woman facing the camera to say, “Come on, Joe, don’t be scared. It’s all love,” as she plays the piano below the frame. A few seconds in, seven people in black T-shirts and sunglasses slowly rise from behind her to harmonize as she sings an original ballad about the actor who plays Game of Thrones’ most low-key heartthrob, Gendry Baratheon.