- The following belong to the first degree:
(a) In the entrance rites: the greeting of the priest together with the reply of the people; the prayer.
(b) In the Liturgy of the Word: the acclamations at the Gospel.
(c) In the Eucharistic Liturgy: the prayer over the offerings; the preface with its dialogue and the Sanctus; the final doxology of the Canon, the Lord’s Prayer with its introduction and embolism; the Pax Domini; the prayer after the Communion; the formulas of dismissal.
- The following belong to the second degree:
(a) the Kyrie, Gloria and Agnus Dei;
(b) the Creed;
(c) the prayer of the faithful.
- The following belong to the third degree:
(a) the songs at the Entrance and Communion processions;
(b) the songs after the Lesson or Epistle;
(c) the Alleluia before the Gospel;
(d) the song at the Offertory;
(e) the readings of Sacred Scripture, unless it seems more suitable to proclaim them without singing.
- The custom legitimately in use in certain places and widely confirmed by indults, of substituting other songs for the songs given in the Graduale for the Entrance, Offertory and Communion, can be retained according to the judgment of the competent territorial authority, as long as songs of this sort are in keeping with the parts of the Mass, with the feast or with the liturgical season. It is for the same territorial authority to approve the texts of these songs.
- It is desirable that the assembly of the faithful should participate in the songs of the Proper as much as possible, especially through simple responses and other suitable settings.
The song after the lessons, be it in the form of gradual or responsorial psalm, has a special importance among the songs of the Proper. By its very nature, it forms part of the Liturgy, of the Word. It should be performed with all seated and listening to it – and, what is more, participating in it as far as possible.
- The songs which are called the “Ordinary of the Mass”, if they are sung by musical settings written for several voices may be performed by the choir according to the customary norms, either a capella, or with instrumental accompaniment, as long as the people are not completely excluded from taking part in the singing.
For the last degree the US GIRM says
48. This chant is sung alternately by the choir and the people or similarly by a cantor and the people, or entirely by the people,
or by the choir alone. In the Dioceses of the United States of America, there are four options for the Entrance Chant: (1) the antiphon from the Missal or the antiphon with its Psalm from the Graduale Romanum, as set to music there or in another setting; (2) the antiphon and Psalm of the Graduale Simplex for 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) another
liturgical chant that is suited to the sacred action, the day, or the time of year, similarly approved by the Conference of Bishops or the Diocesan Bishop.
So the Entrance, Offertory and Communion chants are the last option.
And within this option the last option is to sing “another liturgical chant”
or as happens in many churches I’ve been to here in Oz, 4 songs.
Enjoying the thread!