In this regard, it must be noted that if any local custom of playing the organ during low Mass might interfere with the participation of the faithful, either by common prayer or song, the custom is to be abolished. This applies not only to the organ, but also to the harmonium or any other musical instrument which is played without interruption. Therefore, in such Masses, there should be no instrumental music at the following times:
a. After the priest reaches the altar until the Offertory;
b. From the first versicles before the Preface until the Sanctus inclusive;
c. From the Consecration until the Pater Noster, where the custom obtains;
d. From the Pater Noster to the Agnus Dei inclusive; at the Confiteor before the Communion of the faithful ; while the Postcommunion prayer is being said, and during the Blessing at the end of the Mass.
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