The musical writings of scientist Hermann von Helmholtz (1821 1894) have long been considered epoch-making in the histories of both science and aesthetics. Widely regarded as having promised an authoritative scientific foundation for harmonic practice, Helmholtz can also be read as posing a series of persistent challenges to our understanding of the musical listener. Helmholtz was at the forefront of sweeping changes in discourse about human perception. His interrogation of the physiology of hearing threw notions of the self-possessed listener into doubt and conjured a sense of vulnerability...