Laurel Braitman is a historian of science and the author of Animal Madness: How Anxious Dogs, Compulsive Parrots, and Elephants in Recovery Help Us Understand Ourselves. She’s particularly interested in animals held in captivity. “If their minds aren’t stimulated and challenged they can end up with all sorts of disturbing behaviors,” she explains. Braitman wondered if music — so often soothing to people, but usually foisted on animals without their permission — could help counter animal anxiety and depression?