To accompany Music Week's feature on the YouTuber phenomenon, Kilimanjaro Live promoter Mark Walker picks out three acts he works with who are destined for big things...

Name: Jacob Sartorius

Age: 14
Nationality: American
YouTube subscribers: 2.2m
Twitter followers: 1.17m

Walker says: “I feel like he’s the new Justin Bieber because he’s only 14 and yet we’ve sold out 2,300 tickets at IndigO2 and we’ve sold out Birmingham Academy and Manchester Academy, both ...