Fiona Amaka’s new single, “Cowards and Shadows,” doesn’t kick down the door; it slips the lock and vanishes into the night, leaving the chain on. There’s a particular London cool to this departure, a swagger in its disappearing act. The track's lauded Bowie-esque posture is immediately apparent, thanks in no small part to Andy Zanini's sharp, stalking guitar work. It’s less a gentle fade...

Ultan’s single, "The Tempest," erupts not so much into the room as it does through the floorboards, dragging with it the scent of wet wool and imminent confrontation. This Dublin solo musician, a cartographer of past agonies, presents an energetic rock piece that feels less like a song about history and more like a fragment of it, throbbing and urgent. The main riff careers...