SARAH HARMER Oh Little Fire [Zoe/Rounder] Canadian Sarah Harmer’s fifth album offers her most engaging effort since her days in the 1990s group Weeping Tile. While her last offering, 2005’s I’m a Mountain, included intimate observations from an eco expedition through Southern Ontario’s Niagara Escarpment, the new record has her lightening her load with subjects less dire and more inclusive. By finding footing in cheerier realms, Harmer sounds...