Justin Bieber

Bieber's YouTube renditions of Ne-Yo and Alicia Keys were discovered by manager Scooter Braun in 2008. He has since had five No. 1 albums on the Billboard 200.

 

Austin Mahone

Currently opening for Taylor Swift, Mahone collaborated on a rendition of "Say You're Just a Friend" with Flo Rida and recently released "What About Love" (Chase/Republic), which debuted at No. 74 on the Billboard Hot 100.

 

MattyB

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