The music of British singer-songwriter Benjamin Francis Leftwich is equal parts somber and uplifting, a combination that would easily find its way into the compilation albums of The OC or House. But although he impressed with the expansive soundscapes he created within his two albums (especially sophomore album After the Rain), Leftwich treated listeners at U Street Music Hall to a spartan setup that hearkens back to his beginnings - with just him and a guitar on stage.