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EasterJoy
Guest
No, the Church does not exactly say that. Sacrosanctum Concilium gives pride of place to Gregorian chant and to the organ, but does not go so far as you do.…in the realm of Church music, straight up, Gregorian chant is the true ideal standard of sacred music; the closer something resembles Gregorian chant, the more suited it is to the Liturgy; the less something resembles Gregorian chant, the less suited it is to the Liturgy…
*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.* –(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.)
Gregorian chant is monophonic, has free rhythm, and is sung a capella. That does not mean that a piece of music that is monophonic is automatically more suitable than a piece that is polyphonic, that a piece with free rhythm is automatically more suitable than a piece with a proscribed rhythm, or that a piece written to be sung a capella is automatically more suitable than a piece that has an instrumental accompaniment.
The feature of Gregorian chant that makes it the liturgical ideal is its prayerful quality. That is a little less strictly defined than the other features I listed, but it is the essential quality towards which the other three tend together when prayer is chanted in a liturgically ideal way.
Therefore I’d say that the more a piece sounds prayerful instead of reflecting a secular mood or a mood distracted from God, the more suitable it is for the Mass. The more suitable a piece of music is for a particular congregation to sing the prayers of the Mass together in a whole-hearted way focused on God, the object of our prayer (rather than some other way–distracted, mechanical, half-hearted, and so on), the more it is suitable for the Mass.
There is a way in which you and I do not agree, but there is a way in which we do. Musical decisions for a liturgy ought to be made so that the prayers will lifted in the most prayerful way that is likely to be attained by that congregation on that day, given the situation of those people.
Back to the beginning: a classical guitar might be among the most suitable instruments available for leading a congregation to lift their song in prayer in a way that sounds and is experienced as exceptionally prayerful, depending on who and what is locally available. It depends on what instruments are available and who is playing them. I have heard too many organs played by someone who sounds as if their training was at the ballpark or the old movie theatre, thrilling the crowd on the Mighty Wurlitzer. The sad problem was that this is not their intention. No, they were simply not the masters of their instrument. That is a case where a classical guitar played by someone who has mastered its use in a sacred setting would be far better than an organ.