There was a time when Oh Susanna, a.k.a. Suzie Ungerleider, sang mostly murder ballads. Her songs still have an old-world luster, like intriguing sepia-toned photos, but now they embrace broader themes. Despite a couple of gunfight ditties, including a Bob Dylan cover, her fourth album is largely a collection of memorable songs about love and lust. And when she sings “Holy Roller,” with its parlor-like piano accompaniment, Ungerleider evokes Stephen Foster, from whose classic ballad she took her stage name.