With the same trademark compassion and erudition he brought to The Man Who Mistook His Wife for a Hat, Oliver Sacks explores the place music occupies in the brain and how it affects the human condition. In Musicophilia, he shows us a variety of what he calls “musical misalignments.” Among them: a man struck by lightning who suddenly desires to become a pianist at the age of forty-two; an entire group of children with Williams syndrome, who are hypermusical from birth; people with “amusia,” to whom a symphony sounds like the clattering of pots and pans;