Indeed. Silence is golden. If your celebrant seems allergic to it, you might add the psalm Miserere, or a penitential chant such as Parce Domine or Attende Domine.it is not strictly required to cover all the proceeding with sound of chant
I don't know that there were any.historically, what the alternatives were.
No, it's not. Motets have been permitted during the liturgy for centuries. If you never sing anything but psalm/canticle verses to prolong the Offertory or Communion chants, I can't fault that, but the remaining alternative to a freely chosen Latin text, suitable for the occasion, which you find uncomfortable, or silence, which you find unfitting, is to repeat the appointed chants. The rubrics and other liturgical regulations are not necessarily meant to address every possible foreseeable circumstance, so there is no single "correct" answer as to what may be sung when time remains.The path that leads to ‘alius cantus aptus’ is uncomfortably wide!
Well, that is indeed the situation under discussion here. You are apparently looking for nonexistent supplementary ad libitum propers. At the the other end of things, what if the distribution of ashes or the veneration of the cross finishes well before the assigned chants have been sung? Today, I think the chants have to be completed; I see no rubric suggesting that any of the chant may be omitted or abbreviated. Good Friday is another matter, however, as there are rubrics stating that the chant is continued until the conclusion of the veneration and that the final doxological stanza of "Crux fidelis" is never omitted. (The latter rubric doesn't appear in the "pre-55" books; incidentally, the 1961 Graduale gives two versions of the hymn: the same one included in the Liber, and a "textus antiquus" option.) The rubrics don't specify what should or may be sung when all of the appointed chants are insufficient, which happened here one year.only after the propers had been completed
and I wonder whether, had the congregation turned its mind to the issue, it would have approved such solutions in other related circumstances.
Pope Paul on the New Rite of the Mass (11/26/1969)
“We ask you to turn your minds once more to the liturgical innovation of the new rite of the Mass. This new rite will be introduced into our celebration of the holy Sacrifice starting from Sunday next which is the first of Advent, November 30 (1969).
“A new rite of the Mass: a change in a venerable tradition that has gone on for centuries. This is something that affects our hereditary religious patrimony, which seemed to enjoy the privilege of being untouchable and settled. It seemed to bring the prayer of our forefathers and our saints to our lips and to give us the comfort of feeling faithful to our spiritual past, which we kept alive to pass it on to the generations ahead…
“So what is to be done on this special and historical occasion? First of all, we must prepare ourselves. This novelty is no small thing…
“It is here that the greatest newness is going to be noticed, the newness of language. No longer Latin, but the spoken language will be the principal language of the Mass. The introduction of the vernacular will certainly be a great sacrifice for those who know the beauty, the power and the expressive sacrality of Latin. We are parting with the speech of the Christian centuries; we are becoming like profane intruders in the literary preserve of sacred utterance. We will lose a great part of that stupendous and incomparable artistic and spiritual thing, the Gregorian chant.
“We have reason indeed for regret, reason almost for bewilderment. What can we put in the place of that language of the angels? We are giving up something of priceless worth. But why? What is more precious than these loftiest of our Church’s values?
“The answer will seem banal, prosaic. Yet it is a good answer, because it is human, because it is apostolic.
“Understanding of prayer is worth more than the silken garments in which it is royally dressed. Participation by the people is worth more—particularly participation by modern people, so fond of plain language which is easily understood and converted into everyday speech.”

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