4. Cody Simpson/Karmin
Heartthrob Cody Simpson got his start playing songs on his YouTube channel à la Justin Bieber. He was discovered shortly after and has just released his fifth album.

5. TheFineBros
TheFineBros ‘React’ videos such as Kids React to Gay Marriage or Elders React to Eminim have blossomed into a YouTube TV network with over 12 million subscribers. They keep it coming with weekly shows and video uploads four times a week.