The final performances of castrato Giovanni Battista Velluti in London in the late 1820s constitute a particularly rich vantage point from which to explore why the castrato was eventually forced from the operatic stage. What does this historical moment have to say about shifts in vocal style and audience expectations? Why did the question of castration become so loaded under ‘Romantic’ conditions? This article constructs a speculative theoretical framework by bringing together recent insights in the history of vocal science, histories of gender and subjectivity, the history of listening and opera studies. Velluti's hostile reception in the London press is surveyed in detail, alongside a historically informed examination of his vocal manner. Evidence suggests that the castrato quickly became an unthinkable figure, falling from grace in the wake of embodied conceptions of vocality and ‘natural’ expression, newly dominant ideas that projected him beyond prevailing notions of human nature.