by Ellen DurneyBuzzFeedBuzzFeed StaffHi, I'm Ellen! For those of us who grew up with him and his music, Justin Bieber's headlining shows at Coachella were a joyous celebration of how far he's come since his tumultuous teen pop-star days. However, one very notable figure from his past seemingly did not get an invite to the party. Kevin Mazur / Getty Images Along with Justin's former manager, Scooter Braun, Usher is widely credited with playing a major role in JB's rise to superstardom in the late 2000s and early 2010s.