About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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Much of the beauty of the older forms was lost and the hymns did not really become classical. We have reason to hope that the present reform of the breviary will also give us back the old form of the hymns. But meanwhile it seems necessary to keep the later text. This is the one best known, it is given in all hymnbooks and is still the only authorized form. Only in one case have we printed the older text of a hymn, number 57, “Urbs Jerusalem.” The modern form of this begins: “Caelestis urbs Jerusalem.” But in this case the people who changed it in the seventeenth century did not even keep its metre; so the later version cannot be sung to the old, exceedingly beautiful tune.
— Fr. Adrian Fortescue (1913)

Polyphony (3 voices) by Morales with Hymn (2 voices) for the Holy Trinity
published 28 May 2015 by Jeff Ostrowski

716 Most Holy Trinity AVING A CHORAL piece that’s appropriate during any time of the liturgical year is quite a useful thing. The following musical score is for the Most Holy Trinity—and would work well on Trinity Sunday—but need not be limited to that Sunday alone:

    * *  POLYPHONY & HYMN Holy Trinity

The polyphonic refrain—for 3 voices—is based on a work by Cristóbal de Morales (†1553). The hymn text is from the 13th century, with an English translation by Alan G. McDougall (†1965). The melody for the hymn is called ELY.

Rehearsal videos provided below.

Your organist should download the accompaniment for the verses.

Initially, I was worried about mixing a cappella polyphony with a hymn accompanied by organ. However, this has worked nicely at our parish. I’ve come to enjoy the contrast:

EQUAL VOICES : YouTube   •   Audio Mp3

TOP VOICE : YouTube   •   Audio Mp3

MIDDLE VOICE : YouTube   •   Audio Mp3

LOWEST VOICE : YouTube   •   Audio Mp3