86. While the Priest is receiving the Sacrament, the Communion Chant is begun, its purpose being to express the spiritual union of the communicants by means of the unity of their voices, to show gladness of heart, and to bring out more clearly the “communitarian” character of the procession to receive the Eucharist. The singing is prolonged for as long as the Sacrament is being administered to the faithful. However, if there is to be a hymn after Communion, the Communion Chant should be ended in a timely manner.
Care should be taken that singers, too, can receive Communion with ease.
87. In the Dioceses of the United States of America, there are four options for singing at Communion: (1) the antiphon from the Missal or the antiphon with its Psalm from the Graduale Romanum, as set to music there or in another musical setting; (2) the antiphon with Psalm from the Graduale Simplex of the liturgical time; (3) a chant from another collection of Psalms and antiphons, approved by the Conference of Bishops or the Diocesan Bishop, including Psalms arranged in responsorial or metrical forms; (4) some other suitable liturgical chant (cf. no. 86) approved by the Conference of Bishops or the Diocesan Bishop. This is sung either by the choir alone or by the choir or a cantor with the people. However, if there is no singing, the antiphon given in the Missal may be recited either by the faithful, or by some of them, or by a reader; otherwise, it is recited by the Priest himself after he has received Communion and before he distributes Communion to the faithful.
88. When the distribution of Communion is over, if appropriate, the Priest and faithful pray quietly for some time. If desired, a Psalm or other canticle of praise or a hymn may also be sung by the whole congregation.
During the discussions of the GIRM in the run-up to the new translation last summer, it was pointed out--frequently--that the GIRM sure reads like the choir should sing WHILE people are receiving communion, and the congregational song should come AFTER.
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