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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 21, 2025

PDF Download • “In Paradisum” in English

If anyone wants to download this organ accompaniment, feel free to do so!

Jeff Ostrowski · December 19, 2025

“O Antiphons” Elevated?

From what I can tell, the 1970 rubrics moved each “O Antiphon” to the Gospel Acclamation at Mass (in late December).

Jeff Ostrowski · December 18, 2025

PDF • “Music List” (Sunday, 28 December)

Readers have expressed interest in examining the “music list” I prepared for the feast of the Holy Family.

Jeff Ostrowski · December 16, 2025

Should Catholics Sing Protestant Christmas Carols?

Including the “music list” I have prepared for Christmas Midnight Mass.

Jeff Ostrowski · December 16, 2025

PDF • “Music List” (Xmas Midnight Mass)

Readers have expressed interest in examining the “music list” I prepared for Christmas Midnight Mass.

Jeff Ostrowski · December 16, 2025

What does this mean? “Pre-Urbanite”

This topic I had believed to be fairly well understood—but I was wrong.

Jeff Ostrowski · December 14, 2025

PDF • “Standard Gregorian Chants for Schools, Churches, Seminaries, & Convents” (1946) —123 pages

Until a few days ago, I knew nothing of this (extremely rare) book. Now it’s been scanned and uploaded—free to all.

Jeff Ostrowski · December 11, 2025

PDF • “Music List” (4th Sunday of Advent)

Readers have expressed interest in examining the “music list” I prepared for the 4th Sunday of Advent.

Jeff Ostrowski · December 11, 2025

PDF Download • “Santo Santo Santo”

A brief, bright, stately setting.

Jeff Ostrowski · December 10, 2025

Crucial Tips • “Teaching Children How to Sing”

When it comes to the children, I help them memorize each word…

Jeff Ostrowski · December 10, 2025

Soloists in Gregorian Chant?

An “ensemble of soloists” will never sound the same as a true choir.

Jeff Ostrowski · December 9, 2025

PDF • Our Lady of Guadalupe (12 Dec.)

Why should that feast overpower Our Lady of Guadalupe?

Jeff Ostrowski · December 7, 2025

“Alma Redemptóris Mater” • Everything There Is To Know About This Marian Antiphon

Including a new harmonization for the pipe organ.

Jeff Ostrowski · December 6, 2025

Simplified Accompaniment (Advent Hymn)

Simplified keyboard accompaniment for “Come, Thou Long-Expected Jesus” (Advent hymn).

Jeff Ostrowski · December 4, 2025

PDF • “Music List” (Immaculate Concep.)

Readers have expressed interest in examining the music list I prepared for 8 December (“In Conceptione Immaculata Beatae Mariae Virginis”).

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Corpus Christi Watershed

President’s Corner

    Music List • (2nd Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I created for this coming Sunday, which is the 2nd Sunday of Lent (1 March 2026). If such a thing interests you, feel free to download it as a PDF file. This feast has magnificent propers. Its somber INTROIT is particularly striking—using a haunting tonality—but the COMMUNION with its fauxbourdon verses is also quite remarkable. I encourage all the readers to visit the feasts website, where the Propria Missae may be downloaded completely free of charge.
    —Jeff Ostrowski
    Like! Like! Like!
    You won’t believe who recently gave us a “like” on the Corpus Christi Watershed FACEBOOK PAGE. Click here (PDF) to see who it was. We were not only sincerely honored, we were utterly flabbergasted. This was truly a resounding endorsement and unmistakable stamp of approval.
    —Jeff Ostrowski
    Which Mass?
    In 1905, when the Vatican Commission on Gregorian Chant began publishing the EDITIO VATICANA—still the Church’s official edition— they assigned different Masses to different types of feasts. However, they were careful to add a note (which began with the words “Qualislibet cantus hujus Ordinarii…”) making clear “chants from one Mass may be used together with those from others.” Sadly, I sometimes worked for TLM priests who weren’t fluent in Latin. As a result, they stubbornly insisted Mass settings were ‘assigned’ to different feasts and seasons (which is false). To understand the great variety, one should examine the 1904 KYRIALE of Dr. Peter Wagner. One should also look through Dom Mocquereau’s Liber Usualis (1904), in which the Masses are all mixed up. For instance, Gloria II in his book ended up being moved to the ‘ad libitum’ appendix in the EDITIO VATICANA.
    —Jeff Ostrowski

Quick Thoughts

    Extreme Unction
    Those who search Google for “CCCC MS 079” will discover high resolution images of a medieval Pontificale (“Cambridge, Corpus Christi College, MS 079”). One of the pages contains this absolutely gorgeous depiction of the Sacrament of Extreme Unction.
    —Corpus Christi Watershed
    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

“He would lecture early in the morning at St Edmund’s College, perhaps more than once, rush from thence to the British Museum, and toil there intensely for hours, all without a scrap of food, having pledged himself to dine with us.”

— A description of Father Adrian Fortescue

Recent Posts

  • Music List • (2nd Sunday of Lent)
  • PDF Download • “Funerals in the Ordinary Form”
  • Extreme Unction
  • Like! Like! Like!
  • Which Mass?

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