This is another wonderful book from Dr. Sacks. The subtitle, “Tales of Music and the Brain,” is accurate: we have a charming and informative mixture of stories of patients and the neurophysiology that interprets how music is processed and performed. The book is synthetic in combining cases from his practice, other clinical reports, letters from correspondents, references to medical literature, and even Sacks’s own personal experiences with music.

Sacks finds that humans have a “propensity to music,” something “innate” in human nature, perhaps like E. O. Wilson’s biophilia. “Our auditory systems, our nervous systems,” he writes, “are indeed exquisitely tuned for music” (xi). Although humans have been involved with music for millennia, it is only in the last few decades that medical imaging (functional MRI, PET) has shown what areas of the brain are active when music is heard.

While humans routinely enjoy music, the book emphasizes unusual events and neurological patients, in short, departures from the norm. Sacks—himself a lover of music—reports on his own experiences with hallucinatory music and anhedonia (loss of pleasure) in hearing music. He describes going to hear the great baritone Dietrich Fischer-Dieskau but finding that he could not, on that day, perceive the beauty of the music. Another condition “amusia,” or loss of musical ability, can be chronic, acquired, or temporary.

Some patients have had injuries or diseases of the brain that change how music is perceived. A man hit by lightning is suddenly obsessed with piano music. Another man (who survived a brain infection) has amnesia about many things but can still make and conduct music at a professional level. The concert pianist Leon Fleisher visits Sacks to discuss his dystonia, or loss of muscle function in one hand (with implications for the brain). Rolfing and Botox helped him heal and he returned to two-handed performances.

Sacks discusses other phenomena that involve brain structures, for example, perfect pitch; persons with this ability have “exaggerated asymmetry between the volumes of the right and left planum temporale” (128). People who experience synesthesia (perceiving notes as colors) have cross activation of neurons in different areas of the brain. Professional musicians (and patients with Tourette’s) demonstrate cortical plasticity, that is they have expanded areas of the brain for particular uses. Children with Williams syndrome have brains influenced by a microdeletion of genes on one chromosome; they have some cognitive deficits and also a great responsiveness to music. For some conditions, the brain determines all; for others, behavior components are also important.