Justin Bieber isn't exactly in my musical demographic, but wasn't he some sort of Internet-famous YouTube thing before he was real-world famous? Or is that just the usual puff piece fake backstory?
As he grew up, Bieber taught himself to play the piano, drums, guitar, and trumpet. In early 2007, aged 12, Bieber sang Ne-Yo's "So Sick" for a local singing competition in Stratford and was placed second. Mallette posted a video of the performance on YouTube for their family and friends to see. She continued to upload videos of Bieber singing covers of various R&B songs, and Bieber's popularity on the site grew. Chris Hicks, Bieber's A&R at Island/Def Jam, explained Bieber's huge online following to HitQuarters, stating: "He was doing something different. He was an attractive white kid singing very soulful R&B hits. That set him apart immediately from anyone in his range because no one was covering or singing these kind of records."
FWIW, I don't like Bieber's music. But I respect him as a performer and moreso as a socially responsible figure (e.g. participates a lot in the Make-a-Wish foundation, donates a lot of his money to charities)