Libretto for Caritas an Opera in Two Acts.Caritas’ is in two acts the first consisting of 12 short scenes the second being a continuous scena.The overall form of the opera retains the architecture of Wesker’s stageplay but alters the proportions in order to create a musically dynamic form. While each scene of the first act is centred around a specific pitch the second act is a Passacaglia whose ‘ground’ is a Cantus Firmus eachrepetition of which begins on a different note from those of its previous statements. These large-scale architectural features are both reflected in and derived from the musical material itself.