New norms that reflect a deeply informed perspective on the musical structure of the Roman Rite have been issued by the Vatican. Here they are.

Among them:

The liturgy is celebrated in the Latin language, according to the Roman Rite. Gregorian chant has first place. The guest choir is expected to chant the Ordinary of Holy Mass in alternation with the Musical Chapel of the Basilica.

The guest choir may sing: at the Entrance procession until the moment when the celebrant reaches the altar (the Gregorian Introit is sung by the Musical Chapel of the Basilica), at the preparation of the gifts and relative offertory, at Communion, after the Gregorian antiphon has been sung, and at the end of Mass, after the Blessing. The program of music must follow the Liturgy of the day and will be agreed upon with and approved by the Choirmaster.