Started in the '90s by the late DJ Screw, the Screwed Up Click at once claimed title to the Houston area's strongest rap figures. Death eventually ravaged SUC's leadership — Screw, Fat Pat, Big Hawk and Big Moe are all deceased — which effectively made it possible for anyone with a voice box to claim membership. That in turn effectively made it possible for the Click to exist today as a watered-down, splintered version of itself, but it still must be considered Houston's most influential, most critical creative rap force of all time. Thursday, four of its most consequential remaining members, Lil Keke, Z-Ro, Big Pokey and Lil O, will unite for a proper show at House of Blues, a historic occasion because somehow this is the first time this particular lineup will ever perform together — even though it seems like one of them has performed somewhere in town every Saturday night since 1998. It's like how Al Pacino and Robert DeNiro were both in The Godfather Part II but never appeared onscreen together until 1995's Heat. Be there.