Verbum Domini §70

f) Biblically-inspired liturgical song

70. As part of the enhancement of the word of God in the liturgy, attention should also be paid to the use of song at the times called for by the particular rite. Preference should be given to songs which are of clear biblical inspiration and which express, through the harmony of music and words, the beauty of God’s word. We would do well to make the most of those songs handed down to us by the Church’s tradition which respect this criterion. I think in particular of the importance of Gregorian chant.[246]

[246] Cf. Second Vatican Ecumenical Council, Constitution on Sacred Liturgy Sacrosanctum Concilium, 116; General Instruction of the Roman Missal, 41.