Oratorio consists of two parts. The first part is a gestural and sound performance by Bénédicte Davin, focusing on the face and the hand. This culminates in a vocal improvisation inspired by a 2007 composition by Bénédicte Davin, Cedric Lelièvre and Stéphanie Oertli, written for the performance Beards Daemonie.
Oratorio then performs four earlier pieces by Boudewijn Oosterlynck in a relationship 'live voice and recording'. The first (1977) is performed with the voices of people with severe intellectual disabilities. Manipulation of magnetic tapes brings the emotional charge of their glossolalia closer to vocal works from the Renaissance. HIs three other pieces for instruments and voice (1976 -1978) are revisited by Bénédicte Davin: Le monde et moi, Ronron and Résonances.