Book excerpt: At the evolution of music and introduces surprising new concepts of memory and perception, knowledge and attention, motion and emotion, all at work as music takes hold of us. Along the way, a fascinating cast of characters brings Jourdain's narrative to vivid life: "idiots savants" who absorb whole pieces on a single hearing, composers who hallucinate entire compositions, a psychic who claimed to take dictation from long-dead composers, and victims of brain damage who.