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Corpus Christi Watershed

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

Jeff Ostrowski • Article Archive

A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He completed studies in Education and Musicology at the graduate level. Having worked as a church musician in Los Angeles for ten years, in 2024 he accepted a position as choirmaster for Saint Mary of the Immaculate Conception in Michigan, where he resides with his wife and children. —Read full biography (with photographs).

Jeff Ostrowski · December 24, 2022

PDF • “Silent Night” Harmonization

Here’s a handy organ accompaniment (PDF) in three different key signatures: MIDDLE, HIGH, and LOW. The Latin lyrics (“Silens Nox”) are courtesy of Father Valentine Young, OFM (d. 2020). The organ harmonies are very simple, yet beautiful. Those who desire such a thing may also download a Singer’s Version. For obvious reasons, the choir will […]

Jeff Ostrowski · December 24, 2022

PDF Download • “What Child Is This?” • Jeff’s Arrangement of This Carol … in Latin!

This morning I sat down and arranged what—in my view—is one of the beautiful Christmas carols.

Jeff Ostrowski · December 23, 2022

23 December 2022 • FEEDBACK

A very skilled conductor from another country—who recently posted a recording any conductor would be proud of, displaying a light, pleasant, and professional choral sound—wrote to us on 23 December 2022: “CCWatershed and the Sacred Music Symposia have made a great mark in my musical career and the sound you hear you can proudly say […]

Jeff Ostrowski · December 20, 2022

Choirmasters • “How To Avoid Getting Fired”

Anyone who’s ever stood in front of a choir knows the choirmaster’s vocation is not an easy one.

Jeff Ostrowski · December 20, 2022

19 Dec. 2022 • “Include The Congregation?”

People often ask: “Can Gregorian Chant include the congregation?” The answer is: Yes! Listen to this Live Recording from last Sunday (which was the 4th Sunday of Advent). That is one model—not the only model—demonstrating how a congregation could be included. It’s KYRIE XVII, traditionally sung during Advent.

Jeff Ostrowski · December 20, 2022

“Can You Help?” • (Not asking for $ $ $ )

You can help us by adding yourself to our mailing list. It takes less than 5 seconds: (1) Scroll to the bottom of ANY blog article; (2) Enter your email address. It’s that simple. We’re a tiny 501(c)3 public charity. We exist solely by the generosity of small donors. We have no endowment; we have no […]

Jeff Ostrowski · December 20, 2022

19 Dec. 2022 • “This One Has It All”

In case you missed it, this December 10th article about Dr. Peter Wagner, who founded the GREGORIAN ACADEMY at Fribourg (Switzerland), has it all: (1) A rare download [138 pages] of Dr. Wagner’s Kyriale Accompaniment Book; (2) Biographical information about Dr. Wagner; (3) A special surprise you’ll love; (4) Courtesy of Professor Weaver, a translation […]

Jeff Ostrowski · December 19, 2022

J.S. Bach “Alleluia” • Director Posts Live Recording!

Our singers really love this one…

Jeff Ostrowski · December 18, 2022

PDF Download • “Veni, Veni Emmanuel” for 2 parts

I didn’t have the heart to tell this fellow that the same melody occurs at other times of the liturgical year.

Jeff Ostrowski · December 17, 2022

Available Now! • 4th Sunday of Advent

Those who so desire may now download this organ accompaniment booklet (25 pages) for the 4th Sunday of Advent, including the “O ANTIPHON” for 18 December 2022.

Jeff Ostrowski · December 15, 2022

PDF • “Rorate Mass Musical Booklet” (39 pages)

In my humble opinion, that ‘explanation’ is sheer, unadulterated gobbledygook.

Jeff Ostrowski · December 14, 2022

PDF Download • 1938 “White List of Sacred Music” (Archdiocese of Dubuque, Iowa) — 114 pages!

Their spelling of French names could have used some proofreading!

Jeff Ostrowski · December 13, 2022

Who Can Guess This Melody? • (Rorate Mass)

… from the “Roman Gradual” (1912) edited by Max Springer, a famous Gregorianist of the Beuron school.

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Jeff Ostrowski · December 13, 2022

PDF Download • “Advent Eucharistic Hymn”

I don’t know a more powerful exposition on the Holy Eucharist than this striking hymn by Archbishop Pecham!

Jeff Ostrowski · December 11, 2022

“Introit” (3rd Sunday of Advent) • Sung According the Church’s Official Rhythm

My humble attempt at singing the Introit for the 3rd Sunday of Advent in accordance with the official rhythm.

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Corpus Christi Watershed

President’s Corner

    PDF Download • “Atténde Dómine”
    Although it isn’t nearly as ancient as other hymns in the plainsong repertoire, Atténde Dómine, et miserére, quía peccávimus tíbi (“Look down, O Lord, and have mercy, for we have sinned against Thee”) has become one of the most popular hymns for LENT—perhaps because it was included in the famous Liber Usualis of Solesmes. This musical score (PDF file) has an incredibly accurate version in English, as well as a nice version in Spanish, and also the original Latin. Although I don’t claim to have a great singing voice, this morning I recorded this rehearsal video.
    —Jeff Ostrowski
    Music List • (1st Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I’ve prepared for this coming Sunday—22 February 2026—the 1st Sunday of Lent (Year A). If such a thing interests you, feel free to download it as a PDF file. As always, the Responsorial Psalm, Gospel Acclamation, and Mass Propers for this Sunday are available at the outstanding feasts website alongside the official texts in Latin. I spent an enormous amount of time preparing this ORDER OF MUSIC—because the children’s choir will join us—and some of its components came out great. For example, the COMMUNION ANTIPHON with Fauxbourdon is utterly resplendent, yet still ‘Lenten’.
    —Jeff Ostrowski
    2-Voice Arrangement for Lent
    Those seeking a two-voice arrangement for LENT and PASSIONTIDE should click here and scroll down. It’s based on number 775 in the Brébeuf Hymnal, with an enchanting melody written by Kevin Allen (the legendary American composer of sacred music). That text—“Pendens In Crucis Cornibus”—is often used for the Feast of our Lady of Sorrows. That link is important because, in addition to the musical score, it provides free rehearsal videos for each individual voice: something volunteer choirs appreciate!
    —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

“To treat harmony and rhythm in this matter was a difficult matter. Facing numerous problems both large and small—that arose constantly—we understood that a flawless harmonization of Gregorian chant cannot be created by improvisation, no matter the competence and ability of the organist or harmonist.”

— ‘Mons. Jules Van Nuffel, NOH Preface’

Recent Posts

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  • Fulton J. Sheen • “24-Hour Catechism”
  • The Weekday Communions of Lent
  • PDF Download • “Atténde Dómine”

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