Lullabies are among the saddest songs of humankind. Musically, their sadness is not of a grieving or lacerating or heavy kind, however — but rather, most often, of soft melancholy. But their lyrics range from soothing, to mirthful, even playful, to dark and macabre. Lullabies are as much for the lulled as they are for the lulling.