Think of the patience it requires to play in Horse Lords. You’ve trained your fingers and ears to the surgical fine point wherein you can play your instrument, cleanly and unerringly, against two or three conflicting meters. And then you bring this talent to bear on a piece like “Playing and Reality,” from their latest full-length, Demand to Be Taken to Heaven Alive!, which asks you to play the same four notes, in the same order, in lockstep. Over and over and over again.