In the absence of sound, interior listening mediated by imagination, intellect, memory, wonder, desire, and virtually involuntary physical impulses, helps us imagine voices we cannot hear. This talk wonders how these can be deployed in conjunction with hard acoustic and anecdotal evidence in an effort to recover something of the lost voices of castrated male singers, who from the sixteenth through nineteenth centuries laid the foundations of Western art singing. How might an acoustic phenomenon made up of exceptional timbre, emission, and resonance be rediscovered in the mind’s ear?