1. After the people have assembled, and while the priests and ministers are approaching the altar, the entrance antiphon is sung. Its intonation may be shortened or protracted, or even better, the chant may be begun immediately by everyone. In that case, the asterisk, which in the Graduale indicates the cantor's part, is only to be taken as an indicative sign.
Before the final repetition of the antiphon, the Gloria Patri and the Sicut erat may be sung together as the final verse.
If the singing becomes too protracted through the repetition of the Gloria Patri and the antiphon, the doxology may be omitted. When the procession is very short, only one verse of the psalm need be used, or the antiphon alone may be sung without adding any verses.
8. When the sequence occurs, it is sung after the final 'alleluia by the cantors and choir alternating or by two parts of the choir alternating. Amen is omitted at the end. If the Alleluia and its verse is not sung, the sequence is omitted.
I once stayed in Oxford for a weekend conference in what still bore the name of 'the New Building' despite that having been bestowed over 600 years earlier. When I say/sing the Office I am still officially using the 1953 Grail 'New translation'.
FWIW I frequently adjust the verses and repetitions in the introit to match the amount of time available. I also sing the sequence sequentially after the Alleluia, rubrics to the contrary be damned!
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