Agnus Dei (music) Agnus Dei (music) Agnus Dei, referring to the Christian theological concept of the Lamb of God and the associated liturgical text from the Roman Catholic Latin Mass, has been set to music by many composers, as it is normally one of the movements or sections in a sung Mass setting. However, sometimes it stands alone, e.g. it provides the lyrics for Samuel Barber's "Agnus Dei", the choral arrangement of his "Adagio for Strings". The Agnus Dei is a setting of the "Lamb of God" litany, based on John the Baptist's reference in to Jesus ("Behold the Lamb of God that
Agnus Dei (liturgy) the Roman Missal, § 83, states: "The supplication "Agnus Dei", is, as a rule, sung by the choir or cantor with the congregation responding; or it is, at least, recited aloud. This invocation accompanies the fraction and, for this reason, may be repeated as many times as necessary until the rite has reached its conclusion, the last time ending with the words "dona nobis pacem" ('grant us peace')." In Tridentine Requiem Masses, the first two invocations ended with "dona eis requiem" (give them rest) instead of "miserere nobis", and the last with "dona eis requiem sempiternam" (give them rest eternal).