Backstage at a show Justin Bieber breaks out his guitar and has a little fun with Kanye West "Heartless" and Drake's "Successful" - One of the fastest growing artists in the world make sure to check out Justin's other videos and his chart rising single ONE TIME. Signed to both superstar Usher and Scooter Braun at Island Def Jam be on the lookout for Justin's debut album "My World" this fall.