"116. The Church acknowledges Gregorian chant a... 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.....
121. Composers, filled with the Christian spirit, should feel that their vocation is to cultivate sacred music and increase its store of treasures.
Let them produce compositions which have the qualities proper to genuine sacred music..."
"4. It is to be hoped that pastors of souls, musicians and the faithful will gladly accept these norms and put them into practice, uniting their efforts to attain the true purpose of sacred music, "which is the glory of God and the sanctification of the faithful."[1]
(a) By sacred music is understood that which, being created for the celebration of divine worship, is endowed with a certain holy sincerity of form.[2]
(b) The following come under the title of sacred music here: Gregorian chant, sacred polyphony in its various forms both ancient and modern...
52. In order to preserve the heritage of sacred music and genuinely promote the new forms of sacred singing,...37] Above all, the study and practice of Gregorian chant is to be promoted, because, with its special characteristics, it is a basis of great importance for the development of sacred music.
53. New works of sacred music should conform faithfully to the principles and norms set out above. In this way they will have "the qualities proper to genuine sacred music, being within the capacities not merely of large choirs but of smaller choirs, facilitating the participation of all the faithful."[38]"
The vast majority of motets, used in the EF at any rate, were polyphonic settings of the Proper texts, as you well know.
Now if you'll excuse me I have to go look up "sardonic".
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