As Rosa, Federico's mother, Rosalind Plowright is in fine form, even if she cuts a rather stiff figure on stage. Once a dramatic soprano, she is now a super-dramatic mezzo, her chest register filled with pain, her top notes suffused with melancholy. A prominent beat in the voice only amplifies the impression of a woman near the edge: "To be a mother is to be an inferno," she sings, and we feel the heat. Indeed, so keen is she to advise the young, innocent Vivetta on how to seduce her son that one wonders what her relationship with him is.