By Sinead Garvan
Newsbeat entertainment reporter in Balado
Paolo Nutini surprised fans by playing new songs for the first time in the UK at T in the Park.
Nutini performed under the name Snake Derrick And The Vipers
The 5pm slot on the T Break stage on Saturday wasn't confirmed until hours before Snake Derrick And The Vipers took to the stage.
Paolo Nutini told Newsbeat why he decided to go under a different name.
He said: "It's just a bit of fun, it gives us a way of doing new songs and not worry about playing so much from the last time.
He added that the idea for the name came from a computer game.
"I was playing the football pro-evolution game and there was a guy called Snake Derrick on there and he scored a lot of goals for me so I thought it would be a good name," he said.
Fans of Paolo shouldn't worry though. He's not keeping his new name.
He said: "This should be the only time Snake Derrick does any gigs."
Those who packed into the T Break tent seemed to love his new material as much as when he belted out New Shoes at the very end.
The crowd left delighted they had caught this one-off performance of Snake Derrick And The Vipers.
Plastic snakes and T-shirts were handed out by Paolo and his band at the end, perhaps to ensure they wouldn't be forgotten.
Jenny from Glasgow had no idea he was playing.
She said: "It was a surprise, he was so good. Brilliant, brilliant, better than his old stuff."
Katy from Kinross loved hearing the new material: "Great yeah, he's kind of making him a true artist, being more rootsy, not really giving a damn what everyone else thinks and not trying to do the pop thing."
It certainly wasn't particularly poppy.
Most of the tracks included a saxophone, maracas and a harmonica giving it a more jazzy and even country and western feel.
There was even a bit of country dancing on stage at one point.
There are 11 stages at this year's T in the Park festival site
Paolo told Newsbeat: "It's probably a bit more dynamic than in the first record.
"If you scratch it there's a little bit more to it. This is just some more [tracks] to gig with really."
So when will everyone else hear his new material?
"Not sure. As soon as it's ready I guess. I'm producing it myself," he said.
"It's coming along, mixing it soon. Hopefully by October."