They are also supposed to continue throughout, but not beyond, the action. This is stated explicitly for the Communion. Does this mean that if you run out of text, you should sing something else? (eg. part of a hymn, respecting the integrity of the thought)... But there is an option regarding versicles, even including omission of some of them, provide the versicles retained express a complete thought ...
If he doesn't want both, then there's no reason to include a hymn.
If the pastor says that you are replacing all other music with a full congregational kazoo band, then hope he is joking.
Maybe I'm just...
GIRM 111. There should be harmony and diligence among all those involved in the effective preparation of each liturgical celebration in accordance with the Missal and other liturgical books, both as regards the rites and as regards the pastoral and musical aspects. This should take place under the direction of the rector of the church and after consultation with the faithful in things that directly pertain to them. However, the Priest who presides at the celebration always retains the right of arranging those things that pertain to him.
...IN ACCORDANCE WITH THE MISSAL AND OTHER LITURGICAL BOOKS...
...the right of arranging those things that pertain to him.
It seems to me that the idea that liturgy is the sole concern of the celebrating priest is responsible for the gross laxity in liturgics that infect our parishes and seminaries, and, even university chapels and cathedrals. With such a notion in store these men play havoc with Vatican II's precepts about liturgy and music.
Fr. Keyes, a relatively known name around the CMAA, used to do missions around the country and his (I believe sole) request to the parish was that the actual text of the Responsorial Psalm be sung using the actual text of the Psalm - what he found was quite different.
we had a read Responsorial Psalm plus a hymn after the second reading.
the musicians might start replacing the psalm with a hymn, not knowing that to do so is forbidden in the GIRM.
Talk to the pastor. The pastor needs to have the discussion with the visiting priest. If your pastor says do the antiphon and hymn, then do both. If the pastor says do what ever the priest celebrant says, then do whatever the priest presiding at the given liturgy says.
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