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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 · November 9, 2023

“Organ Interlude” (Dom Gregory Murray)

In my humble opinion, Dom Gregory Murray (d. 1992) was a splendid composer. Here’s my attempt to perform one of his INTERLUDES on the pipe organ. I’m not a “concert organist” so I deeply appreciate any feedback—especially about registration. By the way, you can download a fantastic collection of ORGAN INTERLUDES—all 104 pages completely free […]

Jeff Ostrowski · November 9, 2023

November Reminder • Please help!

Many still don’t know about our email newsletter! Please sign up! Simply scroll to the bottom of any blog article and enter your email address. It helps us very much when you join our mailing list. Thank you!

Jeff Ostrowski · November 8, 2023

1950s Mandatory Military Service? Huh?

I would be very curious to know what readers think about this claim made by Patrick J. Buchanan. He says military service in the 1950s was obligatory in the United States. Is this true? Let me know your thoughts by scrolling to the bottom of this page, where an email address is provided. Patrick J. […]

Jeff Ostrowski · November 8, 2023

“No Fourth Sunday of Advent” (EF)

In the Extraordinary Form (“Missale Vetustum”) because Christmas falls on a Monday in 2023, the Vigil of the Nativity of Our Lord takes precedence over the Fourth Sunday of Advent. This usually only happens about every six years or so. I will miss the 4th Sunday of Advent, but the VIGIL Mass is also quite […]

Jeff Ostrowski · November 5, 2023

When just 13 years old, Beethoven……

Bach’s Well-Tempered Clavier (WTC) was not officially published until 1801. By that time, many hand-copied manuscripts had circulated through Europe. According to Charles Rosen: “Beethoven, at the age of 13, played the entire WTC in public.” His feat was published in the newspapers of that time. In my view, both books of the WTC—with a […]

Jeff Ostrowski · November 4, 2023

PDF • Draft Booklet “Couture Chant” (255 Pages)

This is very much a “work in progress”…

Jeff Ostrowski · November 3, 2023

Dissonant Chord? • (not in context)

If you play nothing but the notes and chord highlighted by yellow in this passage from the “Haec Dies” Gradual, it’s quite ugly and dissonant. However, in the context of the stepwise descending bass-line, the LEMMENSINSTITUUT does not disappoint!

Jeff Ostrowski · October 31, 2023

Cardinal Newman • “Hymn for Souls in Purgatory”

A way to avoid having the choir’s pitch sink. (Tag: 𝘛𝘳𝘪𝘤𝘬𝘴 𝘧𝘰𝘳 𝘵𝘩𝘦 𝘤𝘰𝘯𝘴𝘤𝘪𝘦𝘯𝘵𝘪𝘰𝘶𝘴 𝘤𝘩𝘰𝘪𝘳𝘮𝘢𝘴𝘵𝘦𝘳)

Jeff Ostrowski · October 31, 2023

PDF Download • “Choral Warm-Up” by Jeff Ostrowski (after Morley)

The “SSS” technique, known by every great singer. (Tag: 𝘛𝘳𝘪𝘤𝘬𝘴 𝘧𝘰𝘳 𝘵𝘩𝘦 𝘤𝘰𝘯𝘴𝘤𝘪𝘦𝘯𝘵𝘪𝘰𝘶𝘴 𝘤𝘩𝘰𝘪𝘳𝘮𝘢𝘴𝘵𝘦𝘳)

Jeff Ostrowski · October 26, 2023

PDF Download • “Hymn for the Feast of All Saints” (Released for the First Time in History!)

“Each day Father Knox would write for his students a Latin poem describing events of the previous day.” —Archbishop Fulton J. Sheen

Jeff Ostrowski · October 25, 2023

“Secret Trick” of Jeff Ostrowski • Re: Singing Amen

“Sic transit gloria mundi…” (𝑇ℎ𝑢𝑠 𝑝𝑎𝑠𝑠𝑒𝑠 𝑡ℎ𝑒 𝑔𝑙𝑜𝑟𝑦 𝑜𝑓 𝑡ℎ𝑒 𝑤𝑜𝑟𝑙𝑑.)

Jeff Ostrowski · October 25, 2023

Now Available Online! • 1959 “Organ Accompaniment Book” (233 Pages)

“Occasionally, the English texts for some of the hymns are almost barbaric artistically…” —𝐷𝑜𝑚𝑖𝑛𝑖𝑐𝑎𝑛𝑎 𝐽𝑜𝑢𝑟𝑛𝑎𝑙 (1960)

Jeff Ostrowski · October 23, 2023

Jeff As Organist? • His Attempt…

I’m attempting to record (on the pipe organ) any hymn contained in the Brébeuf Hymnal which doesn’t yet have its own rehearsal video with real voices. You can listen to my latest attempt: a hymn called DEVONSHIRE. For the second verse, I attempted to change the registration. Please let me know what you think. I […]

Jeff Ostrowski · October 23, 2023

“Did One Man Single-Handedly Sabotage the Gregorian Restoration?” • (Part 2 of 2)

Will anyone step forward to defend this?

Jeff Ostrowski · October 20, 2023

Playing Pipe Organ = Very Difficult!

Not every hymn contained in the Brébeuf Hymnal has its own rehearsal video. In the meantime, I’m attempting to provide pipe organ recordings for the missing hymns. Today, I attempted to record COBLENZ, with a harmonization based on Sir Richard R. Terry. You can listen to my recording by clicking here. Whenever the record button […]

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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

    “Reminder” — Month of Febr. (2026)
    On a daily basis, I speak to people who don’t realize we publish a free newsletter (although they’ve followed our blog for years). We have no endowment, no major donors, no savings, and refuse to run annoying ads. As a result, our mailing list is crucial to our survival. It couldn’t be easier to subscribe! Just scroll to the bottom of any blog article and enter your email address.
    —Jeff Ostrowski
    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

“It is true that I have a preference for those who are discarded,” said Francis, for he is a humble man and would be the first to admit it.

— Tim Stanley, writing for “The Telegraph” on 13 March 2023

Recent Posts

  • Which Mass?
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  • PDF Download • “Pange Lingua” in Simple (Contemporary) Polyphony for Three Voices
  • PDF Download • “Gregorian Chant Booklet” mailed by Pope Saint Paul VI to every bishop
  • My Response Surprised A Parishioner ‘Upset’ About Latin

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