Kentuckian singer-songwriter Joan Shelley draws many, many comparisons to legendary English folk singer Sandy Denny, and it’s true that they share a similar vocal range and fondness for languidly paced songs. But Shelley’s recent “Cost of the Cold” single is a slight departure for the singer. There are fewer high notes, less of what a curmudgeon might call preciousness. She sounds less like a folk singer and more like Mimi Parker from Low. We don’t yet know whether Shelley will keep pushing in that direction; her fourth album, produced by Wilco’s Jeff Tweedy, won’t be out until spring. Ian Fitzgerald opens.