"At low Mass the faithful who participate directly in the liturgical ceremonies with the celebrant by reciting aloud the parts of the Mass which belong to them must, along with the priest and his server, use Latin exclusively. But if, in addition to this direct participation in the liturgy, the faithful wish to add some prayers or popular hymns, according to local custom, these may be recited or sung in the vernacular."
14. a) In sung Masses only Latin is to be used. This applies not only to the celebrant, and his ministers, but also to the choir or congregation.
"However, popular vernacular hymns may be sung at the solemn Eucharistic Sacrifice (sung Masses), after the liturgical texts have been sung in Latin, in those places where such a centenary or immemorial custom has obtained. Local ordinaries may permit the continuation of this custom 'if they judge that it cannot prudently be discontinued because of the circumstances of the locality or the people' (cf. canon 5)" (Musicæ sacræ disciplina: AAS 48 [1956] 16-17).
b) At low Mass the faithful who participate directly in the liturgical ceremonies with the celebrant by reciting aloud the parts of the Mass which belong to them must, along with the priest and his server, use Latin exclusively.
But if, in addition to this direct participation in the liturgy, the faithful wish to add some prayers or popular hymns, according to local custom, these may be recited or sung in the vernacular.
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