Agnus Dei (Lamb of God) is a choral composition in one movement by Samuel Barber, his own arrangement of his Adagio for Strings (1936).
In 1967, he set the Latin words of the liturgical Agnus Dei, a part of the Mass, for mixed chorus with optional organ or piano accompaniment. The music, in B-flat minor, has a duration of about eight minutes.
Here is the oustanding rendering of this piece by the Vlaams Radio Koor.
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