On Sacred Music:

1. We don't create the Liturgy, we receive it -- this is why we use antiphons rather than hymns.
2. We don't sing at Mass, we sing THE Mass -- this is why we prefer gregorian chant as well.
3. The human voice is God's instrument by which he desires to be praised -- this is why we favor the organ and flute over other instruments.
4. Notes on the Liturgy of the Word.

Below are a number of reference quotations.

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"Gregorian Chant is, consequently the Chant proper to the Roman Church, the only chant she has inherited from the ancient fathers, which she has jealously guarded for centuries in her liturgical codices, which she directly proposes to the faithful as her own, which she prescribes exclusively for some parts of the liturgy, and which the most recent studies have so happily restored to their integrity and purity. On these grounds Gregorian Chant has always been regarded as the supreme model for sacred music, so that it is fully legitimate to lay down the following rule: the more closely a composition for church approaches in its movement, inspiration and savor the Gregorian form, the more sacred and liturgical it becomes; and the more out of harmony it is with that supreme model, the less worthy it is of the temple. The ancient traditional Gregorian Chant must, therefore, in a large measure be restored to the functions of public worship, and the fact must be accepted by all that an ecclesiastical function loses none of its solemnity when accompanied by this music alone. Special efforts are to be made to restore the use of the Gregorian Chant by the people, so that the faithful may again take a more active part in the ecclesiastical offices, as was the case in ancient times."

-Pope Saint Pius X, Tra le Sollecitudini, November 22, 1903

"It must be holy. It must not allow within itself anything that savors of the profane nor allow any such thing to slip into the melodies in which it is expressed. The Gregorian chant which has been used in the Church over the course of so many centuries, and which may be called, as it were, its patrimony, is gloriously outstanding for this holiness."

-Venerable Pope Pius XII, Musicae Sacrae #42, December 25, 1955

"The Church acknowledges Gregorian chant as specially suited to the Roman liturgy: therefore, other things being equal, it should be given pride of place in liturgical services."

-The Second Vatican Council, Sacrosanctum Concilium #116, December 4th, 1963

Pope Francis, on the 50^th Anniversary of Musicam Sacram – Liturgical Music Conference in Rome: Certainly the meeting with modernity and the introduction of vernacular languages into the Liturgy has raised many problems: of musical languages, forms and genres. At times, a certain mediocrity, superficiality and banality have prevailed to the detriment of the beauty and intensity of the liturgical celebrations. That is why the various actors in this field, musicians and composers, conductors and singers in scholae cantorum, and those involved in the liturgy, can make a valuable contribution to the renewal —especially in quality — of sacred music and liturgical chant. (Pope Francis, March 2017)

From Sacrosanctum Concilium: Vatican II on the Liturgy

28. 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.

29. Servers, lectors commentators, and members of the choir also exercise a genuine liturgical function. They ought, therefore, to discharge their office with the sincere piety and decorum demanded by so exalted a ministry and rightly expected of them by God's people.

Consequently they must all be deeply imbued with the spirit of the liturgy, each in his own measure, and they must be trained to perform their functions in a correct and orderly manner.

30. To promote active participation, the people should be encouraged to take part by means of acclamations, responses, psalmody, antiphons, and songs, as well as by actions, gestures, and bodily attitudes. And at the proper times all should observe a reverent silence.

116. The Church acknowledges Gregorian chant as specially suited to the Roman liturgy: therefore, other things being equal, it should be given pride of place in liturgical services.

But other kinds of sacred music, especially polyphony, are by no means excluded from liturgical celebrations, so long as they accord with the spirit of the liturgical action, as laid down in Art. 30.

117. The typical edition of the books of Gregorian chant is to be completed; and a more critical edition is to be prepared of those books already published since the restoration by St. Pius X.

It is desirable also that an edition be prepared containing simpler melodies, for use in small churches.

118. Religious singing by the people is to be intelligently fostered so that in devotions and sacred exercises, as also during liturgical services, the voices of the faithful may ring out according to the norms and requirements of the rubrics.

120. In the Latin Church the pipe organ is to be held in high esteem, for it is the traditional musical instrument which adds a wonderful splendor to the Church's ceremonies and powerfully lifts up man's mind to God and to higher things.

From Musicam Sacram: What Should be Sung & By Whom

28. The distinction between solemn, sung and read Mass, sanctioned by the Instruction of 1958 (n. 3), is retained, according to the traditional liturgical laws at present in force. However, for the sung Mass (Missa cantata), different degrees of participation are put forward here for reasons of pastoral usefulness, so that it may become easier to make the celebration of Mass more beautiful by singing, according to the capabilities of each congregation.

These degrees are so arranged that the first may be used even by itself, but the second and third, wholly or partially, may never be used without the first. In this way the faithful will be continually led towards an ever greater participation in the singing.

29. 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. (Priest: The Lord be with you; People: And with your spirit.)

(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.

30. The following belong to the second degree:

(a) the Kyrie, Gloria and Agnus Dei;

(b) the Creed;

31. The following belong to the third degree:

(a) the songs at the Entrance and Communion processions;

(b) the songs after the Lesson or Epistle; (Responsorial Psalm or Gradual)

(d) the song at the Offertory;

(e) the readings of Sacred Scripture, unless it seems more suitable to proclaim them without singing.

32. 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.

33. 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.

34. 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. (Kyrie, Gloria, Sanctus, Agnus Dei)

In other cases, the parts of the Ordinary of the Mass can be divided between the choir and the people or even between two sections of the people themselves: one can alternate by verses, or one can follow other suitable divisions which divide the text into larger sections. In these cases, the following points are to be noted: it is preferable that the Creed, since it is a formula of profession of faith, should be sung by all, or in such a way as to permit a fitting participation by the faithful; it is preferable that the Sanctus, as the concluding acclamation of the Preface, should normally be sung by the whole congregation together with the priest; the Agnus Dei may be repeated as often as necessary, especially in concelebrations, where it accompanies the Fraction; it is desirable that the people should participate in this song, as least by the final invocation.

35. The Lord's Prayer is best performed by the people together with the priest.[22]

If it is sung in Latin, the melodies already legitimately existing should be used; if, however, it is sung in the vernacular, the settings are to be approved by the competent territorial authority.