I’m not sure I understand what you’re asking here, but yes, the “ideal” is the responsorial psalm appointed for the day in the Lectionary.Which psalm should be sung - as assigned in the Lectionary?
I believe Lucien Deiss had a lot to do with the selection of responsorial psalm texts in the Order of Readings for the post-V2 Mass. My understanding (possibly inaccurate) is that while the genre of the responsorial psalm was a restoration from ancient practice, the actual psalm texts selected were chosen anew with little historical precedent; obviously, though, many points in the liturgical year have “obvious” psalms to sing: Advent = Pss. 25, 80, 85; Christmas = Ps. 98; Epiphany = Ps. 72; Mary = Ps. 45; etc.Who made that assignment?
The graduals from the Roman Gradual or the Simple Gradual, or other songs that carry episcopal approval such as By Flowing Waters, Psallite, etc. Also, the verses may use 1963 Grail instead of the Lectionary’s text, since that psalm translation is used in the Liturgy of the Hours, and it would make no sense to approve it for one part of the liturgy and not for the other. My understanding is that, at this point, it is not “kosher” to use the popular psalm paraphrases (e.g. Haas “The Lord is My Light and My Salvation”) as responsorial psalms.What may be substituted?
I’m again not sure what you mean here. Either the seasonal refrains with proper verses, or the seasonal psalms, may be used in place of the proper psalms.What are the specific rules for the substitution of a Psalm for the assigned Lectionary Psalm?
A booklet that the parish itself would print? I don’t really know here. It would be worthwhile, IMO, to make a congregational “Graduale Populorum” with introit hymns, responsorial psalms, and communion antiphons in the vernacular for Sundays of the entire year. I don’t imagine it would sell well enough, though, for any publisher to give such a project serious consideration.And, what can we purchase and put in the hands of the people that does not show the assigned Lectionary Psalm and raise the question of validity in their minds if we do not sing the assigned lectionary psalm?
None. The Lectionary occasionally gives various options, e.g. for Pentecost or Holy Family.And, as long as we are on the subject, what other readings in the Mass may be chosen rather than following the lectionary.
The Lectionary is a “realization” of the Order of Readings (“Ordo lectionum Missæ”), a book that contains Scripture references, responsorial psalm refrains, and Gospel verses for the Mass.And does the lectionary follow the Ordo...
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