At the turn of the eighteenth century Jean de La Bruyère and many contemporary authors in diverse literary genres undertook intense studies of character that moved beyond popular portraiture to level moral critiques of the social dissimulation rampant in the era. The literary works from François Couperin's personal library and his musical character studies suggest that he too was intrigued with moral issues surrounding character. While musicologists have suggested connections between the character pieces of Couperin and the character studies of La Bruyère, existing comparisons between the two do not explore the moral dimensions of both literary and musical character studies. In this article, I argue that selected musical works from Couperin's four books of pièces de clavecin participated vitally in the moral discourse of the era, taking up similar subject matter to widely read moralistes such as La Bruyère but employing music to articulate social criticism. By making use of the media of music and performance, Couperin's musical portraits extend the scope and power of literary moralism, enlisting musical performance to critique the social performance of false identities.