This May, the husband and wife duo called the Grahams (Alyssa and Doug Graham) will release two brand new works of art: an album, Glory Bound, and a musical documentary film, Rattle the Hocks. The latter is a visual document of the relationship between the railroad system and American roots music. The former is a joyous musical celebration of roots music, a genre that the Grahams have a strong grasp over. Need proof? Give the wry and charming “Biscuits” a spin, which, as the Grahams explain it, is an exercise in euphemism.