““Flickering” is late-night gospel. It opens with sparse piano music, an ambient shimmer by way of producer Haxan Cloak, a shudder that isn’t quite a drop. The crystal-clear, androgynous voice of Josiah Wise, aka serpentwithfeet, beckons to an undefined other in a series of plain-stated longings: “I’m starting to feel the cord connecting us is made of gossamer,” “it hurts that you won’t join me,” “”