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Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”

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Views from the Choir Loft

“Easy Polyphonic Agnus Dei” • Part 3 of 3

Jeff Ostrowski · September 24, 2021

HERE ARE, OF COURSE, numerous reasons authentic Catholic music has not been universally embraced (yet). One reason is difficult for some to accept: polyphony is frequently sung badly—with unbalanced voices, improper vowels, poor tuning, and so forth. The ability to sight-read music instantly does not guarantee a good performance. Choirs must sing polyphony multiple times before the harmonies “click.” Often, a performance can be greatly improved by simply shuffling your singers around. 1

Piecemeal Polyphony: Here in Los Angeles, we take advantage of a solution called “piecemeal polyphony.” I’ve spoken of this before; it means when we sing a polyphonic KYRIE ELEYSON, we begin by singing the third section (which is usually the hardest), mixing with plainsong in an ABA structure. Then we add the “Christe” section. Finally, we add the first section—and the piece is complete.

Bookmark This Link: Today, I am thrilled to release “Part 3 of 3” for a simple polyphonic setting of the AGNUS DEI. You will want to bookmark this URL, where you can easily access all three sections.

If you want to see a “Piecemeal Kyrie,” you can click here.

Here’s the final section:

*  PDF Download • AGNUS DEI (“Part 3 of 3”)
—The 2nd and 3rd sections are by Father Guerrero, the 1st by Nanino.

Rehearsal videos for each individual voice await you at #59013.

Deep Sadness: My soul is sad because most readers will not click on that 59013 link. As a result, they will miss out on the rehearsal videos for each individual voice; and those are very helpful for volunteer choirs! Mark my words: most readers will not explore that link—which fills me with gloom.


NOTES FROM THIS ARTICLE:

1   This is often called “Doctor James Daugherty’s Solution.” It consists of spending hours shuffling your singers, finding out which voices sound good standing next to one another. Shifting “John Doe” from the left side of someone to his right side can instantly make a tremendous difference—but, of course, this requires time and effort.

Opinions by blog authors do not necessarily represent the views of Corpus Christi Watershed.

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Filed Under: Articles, Featured, PDF Download Tagged With: Francisco Guerrero Composer, Piecemeal Agnus Dei, Piecemeal Polyphony, Simple Polyphony Last Updated: February 26, 2022

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About Jeff Ostrowski

Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He resides with his wife and children in Michigan. —(Read full biography).

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Corpus Christi Watershed

President’s Corner

    “Sanctus VIII” • Organ Accompaniment
    A few days ago, I composed this organ harmonization for SANCTUS VIII. This Mass is traditionally called Missa de ángelis or “Mass of the angels.” In French, it is Messe de Anges. You can evaluate my attempt to simultaneously accompany myself on the pipe organ (click here) while singing the melody. My parish is currently singing this setting.
    —Jeff Ostrowski
    Music List • (5th Sund. Ordinary Time)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for this coming Sunday, 8 February 2026, which is the 5th Sunday in Ordinary Time (Year A). If such a thing interests you, feel free to download it as a PDF file. You will probably notice it isn’t as ‘complete’ or ‘spiffy’ as usual, owing to some difficulties which took place this week.
    —Jeff Ostrowski
    PDF • “Communion” (5th Sunday in Ordin.)
    The COMMUNION ANTIPHON for this coming Sunday, 8 February 2026—which is the 5th Sunday in Ordinary Time (Year A)—is truly delightful. You can download the musical score completely free of charge. This text will be familiar to altar boys, because it’s PSALM 42. The Feder Missal makes the following claim about that psalm: “A hymn of a temple musician from Jerusalem: he is an exile in a heathen land, and he longs for the holy city and his ministry in the Temple there. The Church makes his words her own.”
    —Jeff Ostrowski

Quick Thoughts

    “Reminder” — Month of Febr. (2026)
    On a daily basis, I speak to people who don’t realize we publish a free newsletter (although they’ve followed our blog for years). We have no endowment, no major donors, no savings, and refuse to run annoying ads. As a result, our mailing list is crucial to our survival. It couldn’t be easier to subscribe! Just scroll to the bottom of any blog article and enter your email address.
    —Jeff Ostrowski
    PDF Chart • “Plainsong Rhythm”
    I will go to my grave without understanding the lack of curiosity so many people have about the rhythmic modifications made by Dom André Mocquereau. For example, how can someone examine this single sheet comparison chart and at a minimum not be curious about the differences? Dom Mocquereau basically creates a LONG-SHORT LONG-SHORT rhythmic pattern—in spite of enormous and overwhelming manuscript evidence to the contrary. That’s why some scholars referred to his method as “Neo-Mensuralist” or “Neo-Mensuralism.”
    —Jeff Ostrowski
    PDF • “O Come All Ye Faithful” (Simplified)
    I admire the harmonization of “Adeste Fideles” by David Willcocks (d. 2015), who served as director of the Royal College of Music (London, England). In 2025, I was challenged to create a simplified arrangement for organists incapable of playing the authentic version at tempo. The result was this simplified keyboard arrangement (PDF download) based on the David Willcocks version of “O Come All Ye Faithful.” Feel free to play through it and let me know what you think.
    —Jeff Ostrowski

Random Quote

“Life need not mean something. Life is something. And what is it? It is: —the present moment (the only one I really have); —my body and soul; —the task at hand; Almighty God, (source of everything) asks just one thing: that I put my body and my soul into this one moment, this one task … that I might do it as God desires it to be done.”

— Based on an article by Robert Keim

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  • PDF Download • Sanctus VIII Organ Accompaniment (“Mass of the Angels”)
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  • “Let the Choir Have a Voice” • Jeff Ostrowski’s Essay on Choral Music in the Catholic Mass
  • Solfege Volleyball: A Children’s Choir Game

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