The German soprano Wilhelmine Schröder-Devrient had a profound influence on aesthetic ideals regarding vocal delivery and emergent genres for German commentators from Ludwig Tieck to Rellstab and Wagner. With a focus on contemporary biographical sources and reception, this chapter contextualises her reception within the German states as irreducibly hybrid, as a voice that dissolved aesthetic boundaries, most clearly between speech and song. The shifting role of bel canto vis-à-vis contemporary sopranos (Henrietta Sontag / Maria Malibran), and the emergence of new genres characterise her complex reception, all of which is set against Wagner’s own claims for her artistry, following her creation of the roles Adriano (Rienzi), Senta (Holländer), and Venus (Tannhäuser).