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.

Date of composition 1967
Type Chorale Harmonisation
Tonality B-flat Minor
Spoken language Latin
Arrangement of Samuel Barber: String Quartet in B major, Op. 11
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Autotranslations beta Samuel Barber: Agnus Dei en si bémol mineur
Samuel Barber: Agnus Dei in si bemolle minore
Samuel Barber: Agnus Dei b-moll