The prostheses Peter Szendy explores-those peculiar artifacts known as musical instruments-are not only technical devices but also bodies that live a strange phantom life, as uncanny as a sixth finger or a third lung.The musicological impulse to inventory those bodies that produce sound is called into question here. In Szendy's hands, its respectable corpus of scholarship is read aslant, so as to tease out what it usually prefers to hide: hybrids...