My parish is starting a once monthly Novus Ordo in Latin and I am struggling to find resources for the responsorial psalm and alleluia. I know we could chant the gradual and alleluia from the GR but I'm looking for something simpler... Does anyone know if there is a collection of responsorial psalms in Latin that we could use? If it has the alleluia verse set in Latin too that would be also really helpful.
In my opinion the Graduale Simplex is the very best choice, better than the Roman Gradual, for use with Novus in Latin. Modernized from traditional sources, designed for ease of use and for lay participation;, it goes with the Missal of the Novus rite perfectly.
If the Gradual and Alleluia from the Graduale Romanum are too difficult to sing, the Graduale simplex is your next source of Gregorian chant. I would discourage to use a psalm tone for the Gradual; that this method wasn’t adopted as a suitable remedy for the more challenging parts of the Graduale Romanum is the sole reason the Graduale simplex was put together (see Eckhard Jaschinski, Musica sacra oder Musik im Gottesdienst?)
Just look up in the index if the responsorial psalm is somewhere in the GS and use that one. Otherwise, you can look for one of the seasonal psalms (which is allowed according to GIRM).
Sometimes, I compose a responsorial psalm in the style of the GS myself. There are a couple of melodic families, and each uses a flexible formula to set the refrain. @Paul F. Ford has made a practical overview a long time ago.
One thing to note about GS, the Responsorial psalms are responsaries(!) The intention is (or was) that the congregation should repeat the respond directly after its first occurrence in the first verse, not that the cantor should start by stating it as if it were an antiphon as is done in the lectionary.
There is a collection of GS-style Latin responsorial psalms by Jiří Kub, covering a large portion of the liturgical year, but unfortunately the website has been down since several months now and the webarchive didn't harvest the actual music.
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