The music of London producer Mr. Mitch is tough to pin down: Too beat-oriented to be ambient. Too sensitive for grime. Too abstract for R&B. It just might stand alone. A more song-oriented effort than 2014’s Parallel Memories, Devout chronicles such unsexy subjects as marital fidelity (“Pleasure”), familial self-sacrifice (“My Life”), and the growing pains of parenthood (“Priority”) in a way that feels rich, understated, and totally idiosyncratic—grime for grownups, maybe.