I actually don't see it used for Holy Week in the pre-50's rituals, even in the office. Couldn't find any reference to it in the Vesperale Romanum, either.
In the Liber Usualis, Ubi Caritas is the last (viii) of the chants for the Mandatum-
the rubrics stated "it is never omitted." In the new Graduale it was moved to
the Offertorium. So we now sing the chant as a congregational hymn; have the
reception of the Holy Oils w/ "O Redemptor," then as the priest prepares the gifts, the choir sings Durufle's setting.
I just checked the 1871 Graduale Romanum (Ratisbon). In that edition the
Holy Thursday Mass is celebrated, after which there is the procession of the
Blessed Sacrament to the Altar of Repose w/ "Pange lingua," afterward, the
Altars of the church are stripped, while "Deus, Deus meus" is chanted, then "at
the convenience of the clergy," the Mandatum is performed with the appointed
antiphons, (I thought it interesting that "Benedicta sit sancta Trinitas" is one
of the antiphons in this edition). Here the "Ubi caritas" is the final antiphon.
My oldest Liber is 1934, and the Mandatum is in there, but after Mass. I think I've been told that before the reforms of the '50s when it was restored to parish liturgy, the Foot washing was a common Holy (Maundy? remember the origin of the word,) Thursday feature in monastic and other community life.
IIRC this fact, that it had customarily been performed in some convents by the Abbess for her nuns was part of the reasoning behind defying the rubrics in many dioceses and admitting women, girls and boys to the "viri" selected to have a foot washed.
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