British singer Alxndr London possesses a refined, delicate sensibility that seems lacking in many of peers who use R&B as window-dressing or as a source for aesthetic strip-mining. New single “Harrison” feels like authentic creation, a sparse, shifting backdrop hosting London’s controlled, pretty vocal. Easily London’s most impressive offering yet, “Harrison” points to the potential for modern invigoration of old territory when careful craft and appreciation lead the way. Another release that points to London’s promise.