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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

Abbot Joseph Pothier of Solesmes

Jeff Ostrowski · August 25, 2022

“New Gregorian Chant Project” • Part 2

Using this coming Sunday (12th Sunday after Pentecost) as an example.

Jeff Ostrowski · July 22, 2022

PDF Download • Professionally-Scanned “Graduale Romanum” (Schwann, 1908) • 1,129 pages!

This is the “pure” Vatican Edition—technically the only version of the rhythm allowed by Church documents!

Corpus Christi Watershed · July 6, 2022

“Chant Rhythm Wars” • Dueling Lectures!

Ostrowski Vs. Weaver: Solesmes Rhythm, Gregorian Semiology, Dom Mocquereau, Dom Pothier, Mensuralism, and more!

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Jeff Ostrowski · June 22, 2021

PDF Download • Colossally Stupendous “Missal for the Faithful” — 1,142 pages

This is a large file (172 MB), but trust me! You will love it.

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Jeff Ostrowski · May 17, 2021

“Slanty Wampus” Doesn’t Count

From one of my composition teachers…

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Jeff Ostrowski · November 29, 2020

Extremely Rare! • Pages from the “Directorium Chori” (Solesmes Abbey, 1864)

The entire edition was destroyed in a fire (circa 1866) except four rare copies.

Jeff Ostrowski · October 18, 2020

Dom Pothier • “To The Eyes And To The Ears”

For years, I couldn’t understand this business about “the eyes and the ears.” What did Pothier mean? Then it hit me. • Topics include Dom Joseph Pothier, the mora vocis, Abbot Pothier’s brother (Dom Alphonse Pothier), Dom Lucien David, Dom Paul Jausions, and a truly magnificent story about Pope Pius X and Abbot Pothier, which is essential reading+

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Jeff Ostrowski · January 22, 2018

PDF Download • Dom Pothier Biography (1947)

“Dom Pothier himself acted as an illustrator, decorating his work with vignettes, illuminated capitals, tailpieces, even full-page illustrations representing the mysteries of the Annunciation and Christmas.”

Veronica Brandt · June 6, 2015

A hymnal in e-book format

100 pieces of Gregorian chant to carry around in your pocket, with English translations.

Jeff Ostrowski · March 3, 2015

PDF Download • 1895 “Liber Responsorialis” by Solesmes Abbey

This free PDF was provided courtesy of the St. Jean de Lalande Library of Rare Books.

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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

“Parish Priests have to think first of the simple faithful: people now used to the Roman Missal at Mass. They don’t want change.”

— Cardinal Spellman (one of the Vatican II fathers)

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