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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 · June 30, 2020

Draft Document • “Church Music Manifesto” (2020)

We’re living in darkness—but, like the phoenix, authentic Church music can rise from the ashes!

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Jeff Ostrowski · June 28, 2020

Sonata during the Gradual?

Wolfgang Amadeus Mozart wrote seventeen Church Sonatas between 1772 and 1780. These are short pieces intended to be played between the Epistle and the Gospel (during Mass). Shortly after Mozart left Salzburg, the Archbishop mandated that an appropriate choral motet or congregational hymn be sung at that point in the liturgy, with the result that […]

Jeff Ostrowski · June 27, 2020

Sister Goodchild • “Gregorian Chant for Church and School”

This 130-page book can be downloaded for free.

Jeff Ostrowski · June 26, 2020

Note from a reader (25 June 2020)

“Just visited your website for the first time 5 minutes ago. Was that struck by the beauty of the chant and the immense gift of such a beautiful collection that can be downloaded with ease…at no charge! In awe of the gift of this extensive content and the amount of labor that has gone into […]

Jeff Ostrowski · June 24, 2020

PDF Download • “Saint Edmund Jennings Mass”

Today comes the third setting. A total of five Masses will be released.

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Jeff Ostrowski · June 23, 2020

More on the subject of “Mutual Enrichment”

My previous post on this subject was misunderstood in some quarters.

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Jeff Ostrowski · June 19, 2020

Important • Watershed Will Never Be The Same!

On the feast of the Sacred Heart, we present an important memorandum from Corpus Christi Watershed’s president.

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Jeff Ostrowski · June 18, 2020

“Society of Saint Bede” • Free Liturgical Resources

From what I can tell, the website has been around since 2012.

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Jeff Ostrowski · June 17, 2020

PDF Download • “Saint Anne Line Mass”

I will release five (5) Mass settings which come off well with a single cantor & organist; today is the 2nd installment.

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Jeff Ostrowski · June 16, 2020

How Good Are Your Musical Ears? • (Speedy Test)

Can you hear the difference between females and males?

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Jeff Ostrowski · June 12, 2020

Recorded Music At Mass?

Lorin Maazel was conducting major orchestras at the tender age of eight.

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Jeff Ostrowski · June 11, 2020

PDF Download • “Saint Ralph Sherwin Mass”

Over the next few weeks, I will release five (5) different Mass settings which can be sung with a single cantor & organist.

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Jeff Ostrowski · June 10, 2020

Organ Accompaniment • “Pater Noster” (in Latin)

In the Ordinary Form, the “Our Father” is sung by all present.

Jeff Ostrowski · June 10, 2020

Positive Message from a Catholic Priest

Today, we received this wonderful message from a Catholic Priest: I want to say thank you for everything you have done to bring back the sense of the sacred in The liturgy. We are going through a liturgical renewal here in the parish where I was assigned as a parochial vicar. I’ve only been a […]

Jeff Ostrowski · June 5, 2020

Pentecost Melody Added

Let it be known: I have added the Pentecost melody (“Veni Creator Spiritus”) to the Seasonal Benediction website. I am slowly adding all the different melodies for the “O Salutaris Hostia”—so we can be seasonally appropriate during Benediction of the Blessed Sacrament.

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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

And since it is becoming that holy things be administered in a holy manner, and of all things this sacrifice is the most holy, the Catholic Church, to the end that it might be worthily and reverently offered and received, instituted many centuries ago the holy canon, which is so free from error that it contains nothing that does not in the highest degree savor of a certain holiness and piety and raise up to God the minds of those who offer.

— Council of Trent (1562)

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