For "full choir," one can substitute "congregation."The Agnus Dei is sung thrice: either by the full choir, the Intonation being given by one, two or four cantors each time: or alternately, but in such a way as to have the Dona nobis pacem sung by the full choir. (Liber usualis)
Alternation between cantor/all seems to be the preferred method for a chanted Agnus Dei.The invocation Agnus Dei is sung by the cantors, with all responding. This invocation can be repeated as many times as necessary to accompany the breaking of the Bread, keeping the musical form in view. The last time, the invocation is concluded with the words Dona nobis pacem. (1974 Graduale romanum)
Somewhere it says that you can also have the people just join in with 'miserere .../ dona ...'GIRM 83. The supplication Agnus Dei (Lamb of God) is usually sung by the choir or cantor with the congregation replying; or at least recited aloud. This invocation accompanies the fraction of the bread and, for this reason, may be repeated as many times as necessary until the rite has been completed. The final time it concludes with the words grant us peace.
Also, i have always breathed betwee "Agnus Dei" and "qui tollis peccata mundi..." That is how it is edited in GIA. However, when working with my choir, I had us energize and continue to sing through the 'dei" and it produced a lovely sound. I particularly liked that it prevented the choir from emphasizing every syllable and slowing down the chant. How is this chant "properly" sung?
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