Sometimes one little letter can change a word, or a world. "Paint the city pink!" Janelle Monae raps in "Django Jane," the victory lap at the center of Dirty Computer, her third album, first "emotion picture" and winning bid to own the unstable zeitgeist of 2018. (She also says, "let the vagina have a monologue," but we'll get to that later.) Then she grabs the center of that loaded adjective and gently bends it.