It all started in the playground with his good friend Jason who would "just do beats for fun".
"I would jump in, and then harmonise. We thought it was cool so we started to video it," Deno told BuzzFeed.
"It's so cool – everywhere I go I'm noticed, and all my videos are shared, and even really famous people like Stormzy and Geko have recognised me," he said.
UK rapper Stormzy even invited Deno to the studio to feature on a track for his upcoming album! 🙏
"It was MADDD!" Deno told BuzzFeed on Snapchat.
People just can't get enough of his singing 🙌
Could he be the next The Weeknd?
Despite the attention, the 13-year-old seems to be balancing his new-found fame and schoolwork pretty well. "It's not hard coping," he said. "You have to know when is the time for everything, even if you're on a tight schedule."
He also said his family and friends are "so supportive" towards his singing, especially his mum. "They're always offering to take me to places, studios, and events to boost me up," he said.
Deno encouraged his fans to always work hard: "No matter what, keep grinding 💯 ," he said.