TWENTY ONE PILOTS Qudos Bank Arena, December 16 (a version of this review first appeared in the Sydney Morning Herald and @smh.com.au) The standard line in rock is that with a three-piece band there is nowhere to hide as a musician. What then of a two-piece such as Twenty One Pilots, in a room this big? It may be that the answer is when they’re done, there’s nothing left to give. Tyler Joseph, on bass/keys/vocals and balaclava, and Josh Dun, on drums, backflips and sixpack, t