The rather brilliant Tom Windsor from the Schola at St.Bede’s, Clapham Park in London sent me a link to the former sequence for Holy Trinity, Profitentes Unitatem.
Recognize the tune?
It appears that when St. Thomas Aquinas was asked by Pope Urban IV to write some hymns for the new feast dedicated to the Blessed Sacrament he nicked an already probably well known tune by Adam St. Victor.
After the medieval sequence cull of the Council of Trent, St. Thomas’s sequence, the Lauda Sion, the sequence for Corpus Christi remained. The Holy Trinity sequence along with the sequence Laetabundi iubilemus was lost to the ecclesiastical history books.
Tom quotes Dom Gueranger from ‘The Liturgical Year’:-
“The Middle Ages have left us several Sequences for the Feast of the blessed Trinity. They are much overladen with metaphysical terms, and, for the most part, have but little melody or poetry in them. They give us the language of the Schools, with so much roughness, that they would scarcely find any readers now-a-days to relish them. There is one, however the one composed by Adam of Saint Victor which we here insert, as it maintains, even in its scholastic phraseology, all the majesty and melody which characterise the compositions of that great Poet.”
Have a look at some of the other music Tom has typeset.
He is gradually building up a unique collection of forgotten Office hymns and music from other rites. There are also Mass sheets for numerous feast days.