San Fran metallers Skinlab formed in 1994 when former Defiance singer Steev Esquivel hooked up with guitarists Mike Roberts and Gary Wendt, plus drummer Paul Hopkins, and forged ahead with a Machine Head–influenced groove-metal sound that proved popular in the then-massive nu-metal landscape. But that scene pretty much died, and albums sales suffered, so Skinlab split and reformed a couple of times. The current lineup only features Esquivel from that original band, though guitarist Steve “Snake’ Green has been there since ’98. With two fresh faces on board, and no new material since 2011’s The Scars Between Us, we don’t really know what to expect from this show except some heavy riffage. Arrival of Autumn, Luna 13, Humanoid and Gigi & Jake Edgley also play.