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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 · January 21, 2023

Coming Soon! • Symposium 2023

A few weeks ago, dates were announced for Sacred Music Symposium 2023. The rehearsal videos are beginning to appear! For example, the KYRIE ELEYSON contains sections by Lassus, Victoria, and Palestrina. You can see and hear Part 1 at this link. Much more information about this wonderful conference will be released soon!

Jeff Ostrowski · January 21, 2023

“Have We Gone Mainstream?”

A choir member alerted my wife to this video by Scott Hahn. You perhaps recognize a piece that’s been highly promoted by Corpus Christi Watershed: viz. Father Guerrero’s “Sanctus” from Missa Iste Sanctus. I would be interested to learn which choir made the recording (which heavily abbreviates the piece) and whether they used our rehearsal […]

Jeff Ostrowski · January 17, 2023

PDF Download • “Keenly Rare!” • Gregorian Chant Booklet on 5 Lines (1920) — 326 Pages

There must have been a need for such a booklet, otherwise he would not have gone to the trouble of creating it!

Jeff Ostrowski · January 17, 2023

Church Music • “Should It Make Your Congregation Happy or Sad?”

If your priest approaches you after Mass and says the music sounded horrible, it’s incorrect to reply: “Well, that’s how it’s supposed to be.”

Jeff Ostrowski · January 16, 2023

Desperate! • Needing help after robbery

A few years ago, I had valuable books stolen. Recovery efforts with law enforcement have failed, so I’m reaching out to our readers. Can somebody help me obtain VOLUME II and VOLUME VIII of the Nova organi harmonia published in the 1940s and 1950s by the LEMMENSINSTITUUT? As far as I can tell, these volumes can’t […]

Jeff Ostrowski · January 15, 2023

PDF Download • “Organ Accompaniment Booklet” (25 pages) — Vespers, 2nd Sunday after Epiphany

The internet is putting good people in touch with one another.

Jeff Ostrowski · January 14, 2023

Video • “Counting Gregorian Chant” … according to Dom Mocquereau’s Method

The example chosen is the strenuous offertory (“Jubiláte Déo”) for the 2nd Sunday after Epiphany.

Jeff Ostrowski · January 13, 2023

Hymn Experiment • “Does This Work?”

If memory serves, his exact words were: “Gee, I never thought about that before.” Astonishing!

Jeff Ostrowski · January 11, 2023

PDF Download • Max Springer’s Gradual in Modern Notation (870 pages) — Extravagantly Rare!

In addition to this rare book by Max Springer (870 pages), I release the draft copy of a new Gregorian project (157 pages).

Jeff Ostrowski · January 8, 2023

Which Hymnal Did Archbishop Fulton J. Sheen Endorse?

Musicians can have a stronger voice than even the legendary Fulton J. Sheen!

Jeff Ostrowski · January 6, 2023

What Exactly Is Dr. Peter Wagner Talking About?

“These manuscripts had to be sought out in the public or capitular libraries, whose conservators were often hardly supportive of—if not outright hostile to—the reproduction of their treasures.”

Jeff Ostrowski · January 5, 2023

“Solesmes Method” • Where was it developed?

Father Ralph March wrote: “If any single man could deserve the title father of the renewed chant it would be Dom Joseph Pothier.”

Jeff Ostrowski · January 4, 2023

PDF Download • The Official Funeral Booklet for Pope Benedict XVI (37 pages)

We strive to emphasize the positive on this blog, but I have to admit…

Jeff Ostrowski · January 4, 2023

PDF Download • “Corde Natus Ex Parentis” w/ Modern Harmonies (4 pages)

She said: “Jeff, you should record these harmonies with human voices, to illustrate what you mean.”

Jeff Ostrowski · January 3, 2023

FEEDBACK … from New Hampshire

Jeff, thanks for the rare Gregorian accompaniments. I just love all the work you do! About 2 years ago, my parish made the decision to ditch all the contemporary Mass settings (Marty Haugen, and so forth) and to only use the Latin! We currently use the [name redacted of a disposable missal] … some of their accompaniments […]

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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

The Sacrifice is celebrated with many solemn rites, none of which should be deemed useless or superfluous. On the contrary, all of them tend to display the majesty of this august sacrifice, and to excite the faithful, when beholding these saving mysteries, to contemplate the divine things which lie concealed in the Eucharistic Sacrifice.

— Catechism of the Council of Trent (1566)

Recent Posts

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

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