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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

Dr Theodore Marier

Guest Author · March 6, 2024

Saint Paul’s Choir School • “My Reflections”

Saint Paul’s Choir School is the only all boys Catholic choir school in the nation.

Richard J. Clark · July 26, 2023

Theodore Marier Is the Most Important Liturgical Musician—Even Today.

“The more I learn about Marier, the more I am inspired to be a better human being.” —Richard J. Clark

Jeff Ostrowski · June 30, 2023

“Six Suggestions” • Working with Volunteer Choirs

One priest on this committee said something I’ll never forget…

Jeff Ostrowski · May 11, 2023

PDF Download • Extremely Rare! Organ Accompaniment Book (165 pages)

Including an “added bonus” I discovered while researching Julius Bas (an Italian musicologist and organist).

Jeff Ostrowski · March 21, 2023

“Go!” • The Word That Changed My Life Forever

As Americans, we’re “bred from birth” to think of ourselves as little gods who already know everything and require no correction.

Jeff Ostrowski · February 23, 2023

Marier’s Majestic Music • In Singapore?

“One person I spoke to frequently—although I never met him…” (?)

Jeff Ostrowski · February 15, 2023

PDF • 2014 Dissertation: “Plainchant Influence on the Liturgical Music of Dr. Marier” (324 pages)

This treatise (324 pages) is a “must read” for anyone who cares about liturgical music in the Catholic Church.

Jeff Ostrowski · August 4, 2021

It Finally Happened.

Father Valentine used to say: “The cemeteries are full of people who thought they were indispensable.”

Follow the Discussion on Facebook

Jeff Ostrowski · June 29, 2021

“Talk Is Cheap” • Advice For Music Directors

If you fail to carefully plan your rehearsal, you’ll be eaten alive. And rightfully so!

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Jeff Ostrowski · June 15, 2021

Hymn • “Christ is King” (Father Ivor Daniel) + Rehearsal Videos!

“Once there were lost islands, but most of them have been found…”

Jeff Ostrowski · May 21, 2021

“Veni Sancte Spiritus” (Sequence) • 18 Accompaniments

The Pentecost Sequence harmonized by Father Green, Father Jones, Dom Gregory Murray, Max Springer, Achille P. Bragers, and more!

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Jeff Ostrowski · December 22, 2020

“Improving As Musicians” • Eight Suggestions

Did you know I communicate with dead Catholic composers? I’m not joking.

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Guest Author · June 7, 2020

“Comparison” • 15 Traditional Catholic Hymnals

Covid-19 has forced many parishes to remove all hymnals from their pews: A perfect opportunity for change!

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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

“Cardinal Pole’s great synod at Canterbury (1557) wanted a reformed Roman Missal for use everywhere in England.”

— Father Gerald Ellard, SJ

Recent Posts

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

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