This article uses Mozart's unfinished singspiel Zaide (k336b, 1780) and its source singspiel Das Serail to reconsider the eighteenth-century Kindertruppen: wandering troupes of young singers, actors and dancers who performed in the court and commercial theatres of Europe. These troupes' repertoire often self-consciously addressed the blend of charm and impropriety that lay behind their controversial appeal. I consider the subgenre of seraglio opera – popular with both youth and adult troupes – and in particular the motifs of the audition scene and the captive's lament as metatheatrical commentaries on the cultural politics of operatic spectatorship. When young actors inhabited the fictional seraglio, their display offered compelling corroboration of contemporary discourse about propriety, naturalness and absorption in the theatre, as well as the new sense of urgency regarding the sheltering of youthful virtue.