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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 29, 2014

Fr. Jay Finelli Weighs In On The Jogues Missal

“This section immediately brought to mind my mother’s old hand missal.” —Fr. Jay Finelli

Jeff Ostrowski · December 29, 2014

UPDATE * Latin Mass Will Remain In Hollywood

The Ancient Form of Mass will be offered indefinitely at St. Victor Church every Sunday at 7:00pm.

Jeff Ostrowski · December 28, 2014

Musical Resources • Sunday Within The Octave Of Christmas

We will NOT be singing “Rudolf The Red-Nosed Reindeer” for Communion!

Jeff Ostrowski · December 24, 2014

Musical Resources • Christmas Midnight Mass

We will NOT be singing “Frosty The Snowman” for Offertory!

Jeff Ostrowski · December 24, 2014

“Don’t Cross Out Christ On Christmas” — Wrong!

This myth shows great ignorance of ancient (Roman Catholic) manuscripts!

Jeff Ostrowski · December 23, 2014

PDF Download: Rossini “Parochial Hymnal” (1936)

Your Christmas present from Corpus Christi Watershed!

Jeff Ostrowski · December 22, 2014

Pope Paul VI • “Sacrificum Laudis” (15 Aug 1966)

The most progressive pope imaginable who’s given the Church a new direction? Are they aware of this letter?

Jeff Ostrowski · December 19, 2014

Musical Resources • 4th Sunday of Advent

Christmas draws nigh!

Jeff Ostrowski · December 18, 2014

PDF Download: Dominican Breviary From 1967

The book is so large, it must be downloaded in sections.

Jeff Ostrowski · December 18, 2014

Solemn High Christmas Midnight Mass • Hollywood

Oh, please help us spread this exciting news!

Jeff Ostrowski · December 17, 2014

PDF Download: Hymns of the Dominican Missal & Breviary • Fr. Aquinas Byrnes (1943)

Containing literal and poetic translations, author biographies, meter explanations, and much more!

Jeff Ostrowski · December 17, 2014

How Well Did Your Parents Know The Mass?

PDF Download: Order of Mass (Latin & English) printed in THE CROWN HYMNAL of 1911.

Jeff Ostrowski · December 15, 2014

“The Gloves Are Off” — Jonathan Gruber & The Traditional Mass

“The faith of many was quite infantile, I would say.” —Paul Inwood, talking about preconciliar Catholics

Jeff Ostrowski · December 13, 2014

“The Experience After The Council Was So Strong And In Some Cases Violent…” —Cardinal Burke

6 December 2014 interview with Raymond Leo Cardinal Burke by GloriaTV.

Jeff Ostrowski · December 13, 2014

Musical Resources • 3rd Sunday of Advent

Including “Creator Alme Siderum” with English Translation by Rev. Adrian Fortescue.

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Corpus Christi Watershed

President’s Corner

    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
    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
    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

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

“You should try to eat their food in the way they prepare it, although it may be dirty, half-cooked, and very tasteless. As to the other numerous things which may be unpleasant, they must be endured for the love of God, without saying anything or appearing to notice them.”

— Fr. Paul Le Jeune (1637)

Recent Posts

  • PDF Download • “Funerals in the Ordinary Form”
  • Extreme Unction
  • Which Mass?
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  • PDF Download • “Pange Lingua” in Simple (Contemporary) Polyphony for Three Voices

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