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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 · June 11, 2017

Benedictus has been posted!

Extremely short blog post…

Jeff Ostrowski · June 3, 2017

Musical Resources • Pentecost Sunday

“Light most blessèd, shine on the hearts of Your faithful—even into their darkest corners…”

Jeff Ostrowski · June 3, 2017

Musical Resources • Pentecost Sunday 1

“Light most blessèd, shine on the hearts of Your faithful—even into their darkest corners…”

Jeff Ostrowski · May 30, 2017

Psalm Tones Beyond A Doubt

You will want to download this PDF.

Jeff Ostrowski · May 25, 2017

Horrible Hymn Rhymes

“Anyone who sought thee, or made to thee his moan…”

Jeff Ostrowski · May 23, 2017

Rehearsal Videos • “Sanctus & Hosanna” (Guerrero)

Once upon a time, Catholic composers were trained from birth in a special art of musical composition…

Jeff Ostrowski · May 18, 2017

Archbishop Sheen on Liturgy & Plainchant Choirs

“Sisters in pants distribute communion, while priests sit idle in the sanctuary. This ‘option’ results from a decay of the reverence for the Lord’s Presence.” —Fulton J. Sheen (1976)

Jeff Ostrowski · May 17, 2017

Rehearsal Videos • Guerrero “Agnus Dei” (SSATB)

Do you understand why I only apologize once—and not twice—for the Soprano line?

Jeff Ostrowski · May 17, 2017

Rehearsal Videos • “Ave Sacer Christi Sanguis”

Precious few modern masterpieces exist…but this motet by Kevin Allen is one.

Jeff Ostrowski · May 16, 2017

EWTN Video • Priestly Fraternity of Saint Peter

Two members talk about their new CD, “Requiem.”

Jeff Ostrowski · May 10, 2017

Musical Resources • 4th Sunday after Easter (1962)

“…He shall not speak of Himself; but what things soever He shall hear, He shall speak…”

Jeff Ostrowski · May 9, 2017

Guerrero’s Gloria from “Missa Iste Sanctus”

Why Do We Produce Rehearsal Videos? And what made more than 600 people show up for Santa Barbara’s first Latin Mass in fifty years?

Jeff Ostrowski · May 4, 2017

Fulton J. Sheen • World’s Most Progressive Bishop?

Sheen replied: “Mr. President, I’m not the least bit impressed with your source.”

Jeff Ostrowski · April 30, 2017

Justice Antonin Scalia on Church Music

“I would go there Sunday morning and sing Palestrina, William Byrd, Mozart…this magnificent choral music.”

Jeff Ostrowski · April 25, 2017

Brace Yourself • “Raw” Recordings from Solemn Mass

There’s something remarkable about instances where the people involved don’t realize a recording is being made.

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Corpus Christi Watershed

President’s Corner

    “Reminder” — Month of April (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
    Simplified Accompaniment (Easter Hymn)
    Number 36 in the Brébeuf Hymnal is “At the Lamb’s high feast we sing,” an English translation for Ad Cenam Agni Próvidi (which was called “Ad Régias Agni Dapes” starting 1631). As of this morning, you can download a simplified keyboard accompaniment for it. Simply click here and scroll to the bottom. Many organists are forced to serve simultaneously as both CANTOR and ACCOMPANIST. In spite of what some claim, this can be difficult—which explains why choirmasters appreciate these simplified keyboard accompaniments. Sadly, many readers will click that link but forget to scroll to the bottom where the simplified PDF file is located.
    —Jeff Ostrowski
    PDF Download • “Quasi Modo Sunday”
    The Introit for “Quasi Modo Sunday” (12 April 2026) is particularly beautiful. The musical score can be downloaded as a PDF file, and so can the organ accompaniment. The official language of the Catholic Church is Latin (whereas Greek is our mother tongue). Vatican II said Gregorian Chant must be given “first place” under normal circumstances. As a result, some parishes will rightly sing the authentic version. On the other hand, because so many USA dioceses disobey the mandate of Vatican II, some musicians sing plainsong in the vernacular. I have attempted to simultaneously accompany myself on the pipe organ while singing the English version. Although very few take advantage of it, the complete Proprium Missae is posted at the flourishing feasts website.
    —Jeff Ostrowski

Quick Thoughts

    PDF Download • “Anima Christi”
    I received a request for an organ accompaniment I created way back in 2007 for the “Anima Christi” Gregorian Chant. You can download this PDF file which has the score in plainsong followed by a keyboard accompaniment. Many melodies have been paired with “Anima Christi” over the centuries, but this is—perhaps—the most common one.
    —Jeff Ostrowski
    PDF • “Liturgical Law” (467 Pages)
    On Good Friday during the middle ages, the pope privately recited THE ENTIRE PSALTER. If you don’t believe me, see for yourself by reading this passage by Dom Charles Augustine Bachofen (d. 1943). His famous book—called “Liturgical Law: A Handbook Of The Roman Liturgy”—was published by the Benjamin Herder Book Company, which was the American arm (operating out of St. Louis, Missouri) of one of the world’s most significant Catholic publishers. Dom Charles Augustine Bachofen was born in Switzerland but spent his career between the Benedictine monasteries at Conception (Missouri) and Mount Angel (Oregon). His 1931 masterpiece, Liturgical Law can be downloaded as a PDF file … 467 pages!
    —Jeff Ostrowski
    “Gregorian Chant Quiz” • 24 March 2026
    How well do you know your Gregorian hymns? Do you recognize the tune inserted into the bass line on this score? For many years, we sang the entire Mass in Gregorian chant—and I mean everything. As a result, it would be difficult to find a Gregorian hymn I don’t recognize instantly. Only decades later did I realize (with sadness) that this skill cannot be ‘monetized’… This particular melody is used for a very famous Gregorian hymn, printed in the LIBER USUALIS. Do you recognize it? Send me an email with the correct words, and I promise to tell everybody I meet about your prowess!
    —Jeff Ostrowski

Random Quote

Far from dreading an encounter with the Iroquois, Fr. Garnier often told us he would be quite content to fall into their hands and remain their prisoner if—while they were torturing him—he at least had a chance of instructing them as long as his torments lasted. If they allowed him to live, it would afford him a golden opportunity to work for their conversion, which was now impossible, since the gateway to their country was closed as long as they were our enemies.

— Father Ragueneau (Jesuit Relations)

Recent Posts

  • “Reminder” — Month of April (2026)
  • “Gregorian Chant Isn’t a Platform for Your Personal Theories, Jeff” • (A Letter We Received)
  • Request From Australia
  • PDF Download • “Anima Christi”
  • PDF Download • “Rarer Than a Blue Moon” — Side-by-Side English Translation (Pius XII Psalter)

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