Gavin and Stacey fans will likely remember Oscar Hartland, or Neil the Baby, for his heart-warming performance of The Beatle's Blackbird in the sitcom's 2024 finale.
The episode was watched by about 12.3m people on Christmas day and saw Hartland's character serenade the crowd at the wedding of his on-screen dad Smithy, played by James Cordon.
But that was just the start for Hartland, now 17, who says his band is aiming to be "the next 'Phonics, or something like that".
He has recently released a new single and he and his fellow band members are on a "mission to create a new modern sound for Wales".
Hartland, from Machen, Caerphilly county, said his latest release, Wild Bull, was rooted in "being a bit crazy" and the challenges of growing up in the south Wales valleys.
The actor and singer went on his first tour in 2025 and said the past few months had been about "figuring out the earth behind the sound" with his bandmates Cayden Hughes on bass, Aiden Williams on drums, and Deacon Ball on electric guitar.
"We've had lots of people say it's rocky, but it's Welsh and it's got lots of stuff behind it," he told Lucy Owen on BBC Radio Wales .
"Growing up, I was just a wild bull, I was just mental, you know, in school, just out and about, playing rugby, being wild, being crazy. I know loads of my friends who are just the same.
"It's very hard as a young lad, especially Wales in the valleys, to keep yourself contained, because there is so much trouble to get up to."
Hartland said he surrounded himself with music growing up and described himself as a bit of a "black sheep".
"I was playing the piano while everyone else was watching rugby," he said.
But he added the new single was all about "letting go and saying, 'this is me I'm a wild bull'."
Hartland said the response to the song, which was released on Friday, had been brilliant.
"People are loving it, the interaction is nuts... it's really nice.
"The biggest thing is trying to create a movement, that people can feel a part of."
At 14 years old, Hartland took part in The Voice Kids in the hopes of kickstarting his rock career.
His performance of Foo Fighters' My Hero impressed the judges and was also seen by Gavin and Stacey writers James Cordon and Ruth Jones, who approached him with the idea of performing in the series finale.
The Christmas day finale episode became one of the most watched scripted TV shows of the century , seen by 19.11 million people after seven days of catch-up viewing and beating the show's previous record of 17.92m for the 2019 Christmas special.
Nearly two years on, Hartland said it "blows his mind" that people are still talking about it.
"It's ageing well to be fair," he said.
Hartland added support was "always there" from his fellow Gavin and Stacey cast members, which was "lush".
"A lot of people don't really know what it would be like to be in our boots, I suppose, sort of, with the size of it," he said.
He said it was nice to see cast members pursuing "other adventures" too, such as Melanie Walters, who played Gwen, recently taking part in Strictly Come Dancing .
Hartland has been recording at Rockfield studios in Monmouth, which has also played host to the likes of Oasis, Iggy Pop and Queen.
"I want to record there all the time, because I just love what the place is about and I want that to be behind me as well," said Hartland.
"It's spectaular, you feel all of the presence of the past bands there looking at you like 'is he going to make a good song?'"
Despite his developing music career, Hartland said he would not rule out more acting in the future, as he is "just trying things out".
While he has not yet had a chance to cover the iconic Gavin and Stacey theme song, Run by Stephen Fretwell, he said he would love to in the future.
"It's iconic," he said, adding "that would be brilliant".
