So, if the Benedictus is not sung to Gregorian chant, it may follow the Consecration. There is no rule that it must, and it is preferable to have silence, although a motet is expressly permitted after the Benedictus by the motu proprio of St. Pius X.When the Preface is finished, the choir goes on with Sanctus and Benedictus. If these are sung to Gregorian chant they must be given without a break; if not, Benedictus may follow the Consecration. During the Consecration all singing must cease, and (even if there is a custom to the contrary) the organ or other instrument is silent. It is preferable that there should be silence from the Consecration until Pater noster.
That's all it says. The next rubric is about the Agnus Dei. This stands in contrast to the 1871 Gradual, which specifiesVII. Finita Praefatione Chorus prosequitur Sanctus etc. Dum autem elevatur Sacramentum, silet Chorus et cum aliis adorat.
Finita Praefatione chorus prosequitur Sanctus etc. usque ad Benedictus exclusive. Quo finito, et non prius elevatur Sacramentum. Tunc silet chorus et cum aliis adorat. Elevato Sacramento chorus prosequitur cantum Benedictus.
Finita Praefatione chorus prosequitur Sanctus, etc.; Sanctus et Benedictus, si modulis gregorianis decantentur, continue canendi sunt, secus vero Benedictus post Consecrationem ponatur.
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