"This is the most pure version of Justin we've ever seen musically," says the source, adding that Bieber wanted to split from Braun "for a long time"

Those even casually familiar with hip-hop have already long-known Cash Cobain as one of the most-promising, fastest-rising rapper-producers in the game. A week since Justin Bieber’s Swag released, the rest of the music world may be getting to know that too.