Jess Shoman’s music as Tenci is a little like an antique pane of glass, the kind you might find in the window of an old, wooden-shingled beach house. At first glance, the Chicago singer-songwriter’s music sounds like indie rock, more or less conventionally transparent. It’s only when you get up close and squint at the materials, rather than the view through the frame, that the slight warp in perspective becomes apparent. On the surface, “Forgot My Horse’s Name,” the latest single from her upcoming debut album My Heart Is an Open Field, is a country song: a bare-bones waltz kissed with pedal steel, with a sound so stripped down it might have been recorded on a single mic. But listen closely to the details, and Shoman’s wry sense of humor reveals itself. The woodblock rhythm mimics the clip-clop of horse hooves; Shoman’s high, thin, trembling voice is pocked with hiccuping half-yodels. It’s almost pastiche, a fantasy version of a scratchy 45 from a roadhouse jukebox, but the emotion behind it is real. When she sings, “Oh your name,” her voice trailing off into a sigh, you can feel her channeling the sadness of all the ghost towns in the world, a tumbleweed where her heart once was.