This article explores the conspicuous role of singing in the hagiographical construction of saintly women in the thirteenth-century Diocese of Liège. The constellation of Lives about Liégeois women occupies a prominent place in the “origin story” of the new spirituality in the later Middle Ages. However, one aspect of these women's perceived religiosity—their musical and vocal talent—though omnipresent in the sources, has received only sparse attention from scholarship. This article focuses on two of the most important Lives in this group, those of Mary of Oignies and Christina of Sint-Truiden, and demonstrates that hagiographers, mobilizing liturgical vocabulary and ritual ideas identifiable to a local audience, consistently represented women's singing as magnificent ritual performance. By doing so, the hagiographers highlighted these women's privileged access to the divine and distinct potency as intercessors for the living and the dead. This article also intends to show the highly sophisticated ways in which Latin liturgy and its vernacular appropriation, popular ideas and scholastic theories about music were negotiated, developed, and together contributed to a distinctive religious rhetoric in the articulation of female sanctity in thirteenth-century Europe.