“Even though the text of the Roman Gradual, at least that which concerns the singing, has not been changed, still, for a better understanding, the responsorial psalm, which St. Augustine and St. Leo the Great often mention, has been restored, and the Introit and Communion antiphons have been adapted for read Masses.”
-Missale Romanum, 1969
“Nevertheless steps should be taken so that the faithful may also be able to say or to sing together in Latin those parts of the Ordinary of the Mass which pertain to them.”
-Sacrosanctum Concilium, 54
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.
Sacrosanctum Concilium, 116
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.
Sacrosanctum Concilium 120