41. The main place should be given, all things being equal, to Gregorian chant, as being proper to the Roman Liturgy. Other kinds of sacred music, in particular polyphony, are in no way excluded, provided that they correspond to the spirit of the liturgical action and that they foster the participation of all the faithful. [Cf. SC no. 116, & no. 30]
103. Among the faithful, the schola cantorum or choir exercises its own liturgical function, its place being to take care that the parts proper to it, in keeping with the different genres of chant, are properly carried out and to foster the active participation of the faithful by means of the singing. [Cf. S.C.R., Instruction, Musicam sacram, March 5, 1967, no. 19: AAS 59 (1967), p. 306.] What is said about the schola cantorum also applies, with due regard for the relevant norms, to other musicians, and especially the organist.
19. Because of the liturgical ministry it performs, the choir -- or the Capella musica, or schola cantorum -- deserves particular mention. Its role has become something of yet greater importance and weight by reason of the norms of the Council concerning the liturgical renewal. Its duty is, in effect, to ensure the proper performance of the parts which belong to it, according to the different kinds of music sung, and to encourage the active participation of the faithful in the singing. Therefore:
(a) There should be choirs, or Capellae, or scholae cantorum, especially in cathedrals and other major churches, in seminaries and religious houses of studies, and they should be carefully encouraged.
(b) It would also be desirable for similar choirs to be set up in smaller churches.
61. ...In the Dioceses of the United States of America, instead of the Psalm assigned in the Lectionary, there may be sung either the Responsorial Gradual from the Graduale Romanum, or the Responsorial Psalm or the Alleluia Psalm from the Graduale Simplex, as described in these books, or an antiphon and Psalm from another collection of Psalms and antiphons, including Psalms arranged in metrical form, providing that they have been approved by the Conference of Bishops or the Diocesan Bishop. Songs or hymns may not be used in place of the Responsorial Psalm.
Graduale Romanum
5. After the first reading the Gradual Responsory is sung by cantors or by the choir.... [translation mine]
Graduale simplex
18. Paying heed to the principle set forth in the Constitution on the Sacred Liturgy, that "in liturgical celebrations each person, minister or layman, who has an office to perform, should do all of, but only, those parts which pertain to his office by the nature of the rite and the principles of liturgy" [no. 28], by the structure of the chants of the Simple Gradual:
a) The cantor intones the antiphons and proclaims the verses of the psalms, the people responding. The psalm can also be sung by the choir (schola).
b) The assembly of the faithful (coetus fidelium) should sing the antiphons and the responses to the psalms that occur between the readings. On occasion, the faithful may even be given the part of the choir; it is appropriate, however, that at least the responses to the psalms that occur between the readings be proclaimed by the entire assembly, attention being given to their very nature and facility to be sung. [translation mine]
Hence the psalmist, or cantor of the Psalm, sings the Psalm verses at the ambo or another suitable place, while the whole congregation sits and listens
the whole congregation sits and listens, normally taking part by means of the response, except when the Psalm is sung straight through, that is, without a response.
Concerning paragraph 61: the responsorial psalm is a preference, not a requirement.
The first alternative is the gradual from the Graduale Romanum, in which it is inconceivable that the congregation should sing the verse; the traditional rubrics for the gradual assign the verse to cantors, so that not even the choir sings the verse. Other alternatives are collections of psalms and antiphons. Just as with the gradual, these psalms would be performed according to their own manner of performance. Thus. if you are using a collection of psalms with the verses set to Anglican chant, you would have the choir sing them. If you have a collection in which the cantor's part is provided with choral setting, it would come under this rubric and is perfectly permissible, I should think. The only prohibition is againt "songs or hymns."
In light of this possibility of alternatives, paragraph 129 is simply descriptive of the usual practice, and cannot restrict the practice to the responsorial psalm only, since paragraph 61 provides for alternatives to it.
There are ambiguities in the GIRM that mean that one must refer to Musicam sacram, Sacrosanctam concilium, and the entire tradition of teaching about sacred music, all of I think which would concur with what I have said.
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