DJ Quik formed the backbone of West Coast rap with ‘70s and ‘80s funk and R&B. Other rappers have likewise recontextualised older samples; the triumphant, chest-pounding stomp of Kendrick Lamar's “King Kunta” nods to Michael Jackson and Curtis Mayfield. And in Problem's exuberant “Like Whaaat” and YG's raucous “Twist My Fingaz”, there are echoes of Quik's love of distorted keyboard riffs.