After co-founding Def Jam Records in the early 1980s, Rubin helped pioneer the mainstream birth of the hip-hop genre in the late 1980s with the Beastie Boys and Run-DMC.

Since its inception, Hip Hop and fashion have gone hand in hand, and Pharrell is one of the rare figures thriving in both industries. On Wednesday (Dec. 4), during the latest episode of Rick Rubin ...