The fact that there are musicians emerging on platforms like YouTube and Vine isn’t news at all: it’s been happening for a long time. It’s interesting to see what happens when those stars sign to labels though. Canadian teenager Shawn Mendes is on course for a big hit in the US this week with his single ‘Life of the Party’, released through Island Records. Early forecasts suggests he may sell nearly 200,000 copies and debut inside the top 25 of the singles chart. Mendes first made his name on Vine last August with a six-second clip of him singing a Justin Bieber song. He now has 2.7m followers on Twitter’s short-form video network. Fellow teen Troye Sivan is hoping to follow in those footsteps, having parlayed his 2m+ YouTube subscribers into a deal with EMI Australia for a five-song EP: ’TRXYE’.