Populo congregato, et sacerdote cum ministris ad altare accedente, incipitur antiphona ad introitum. Eius intonatio brevior vel magis protracta pro opportunitate fieri potest, vel, melius, cantus potest ab omnibus simul inchoari. Asteriscus proinde, qui ad partem intonationis ignificandam in Graduali invenitur, signum habendum est solummodo indicativum.

Antiphona a choro decantata, versus a cantore vel a cantoribus proferatur, ac deinde antiphona resumatur a choro.

Huiusmodi antiphonre et versiculorum alternatio haberi potest quoties sufficit ad processionem comitandam. Attamen antequam antiphona in fine repetatur cantari potest, ut ultimus versus, Gloria Patri, Sicut erat, per modum unius decantatus. Si autem Gloria Patri peculiarem habet terminationem melodicam, haec eadem terminatio in omnibus versiculis adhibenda est.

Si contingat ex versu Gloria Patri et antiphonae iteratione cantum nimis protrahi, omittitur doxologia. Si autem processio brevior est, unus tantum psalmi versus adhibetur, vel etiam sola antiphona, nullo addito versu.

Quoties vero liturgica processio Missam praecedit, antiphona ad introitum canitur dum processio ingreditur ecclesiam, vel etiam omittitur, prout singulis in casibus in libris liturgicis providetur.

When the people are assembled, and the priest and the ministers approach the altar, the antiphon begins at the entrance. Its intonation can be made shorter or more prolonged according to the occasion, or, better, the chant can be started by all at the same time. Hence the asterisk, which is found in the Gradual to mark the part of the intonation, is to be regarded as an indicative sign only.

After the antiphon is sung by the choir, the verse is recited by the singer or singers, and then the antiphon is resumed by the choir.

Such an alternation of antiphons and verses may be had as often as is sufficient to accompany the procession. However, before the antiphon is repeated at the end, it can be sung, as the last verse, Gloria Patri, Sicut erat, can be sung in the manner of one. But if the Gloria Patri has a particular melodic ending, this same ending must be used in all the verses.

If it happens that the song is too long due to the repetition of the Gloria Patri verse and the antiphon, the doxology is omitted. But if the procession is shorter, only one verse of the psalm is used, or even only the antiphons, without any additional verse.

Whenever the liturgical procession precedes the Mass, the antiphon is sung at the entrance while the procession enters the church, or is omitted, as provided for in each case in the liturgical books.