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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 · August 18, 2015

Improve Your Parish’s Liturgy … Instantaneously!

“Until we are blue in the face, we could repeat what Vatican II said about Gregorian chant…”

Jeff Ostrowski · August 17, 2015

PDF Download • “Mount Mary Hymnal” (1937)

All 255 pages of this famous hymn book can now be downloaded as a PDF.

Jeff Ostrowski · August 13, 2015

Musical Resources • 12th Sunday after Pentecost (Extraordinary Form)

The “Testament of the Spirit” is the new and permanent covenant established by Jesus Christ between God and men.

Jeff Ostrowski · August 12, 2015

Cardinal Sarah’s Powerful Letter Available In English!

“Adoremus Bulletin” has uploaded a translation of the CDW Prefect’s document.

Jeff Ostrowski · August 11, 2015

Evelyn Waugh Requiem Panegyric Preached At Westminster By Fr. Caraman (21 April 1966)

“Evelyn was sad when he read of churches in which the old altar was taken down…”

Jeff Ostrowski · August 11, 2015

Remarkable! • Amiens Cathedral During World War

There’s something scary about this image!

Jeff Ostrowski · August 10, 2015

Carlo Rossini: “Exaltate Deum Hymnal” (1941)

115 Offertories, Motets, and Hymns for SATB choirs.

Jeff Ostrowski · August 9, 2015

Do You Like This German Hymn Tune?

Hymns in 3/4 can present problems, but this one really isn’t…

Jeff Ostrowski · August 7, 2015

Propers for the Assumption (15 August)

Videos, Scores, & Mp3 Files

Jeff Ostrowski · August 6, 2015

Pope Paul VI Celebrates Ambrosian Rite At Vatican II

Cardinal Montini—later known as Pope Paul VI—celebrates Mass in the St. Peter’s Basilica during Vatican II.

Jeff Ostrowski · August 5, 2015

Help Needed From Organists Who Can Improvise!

Are you a composer?

Jeff Ostrowski · August 5, 2015

Musical Resources • 11th Sunday after Pentecost (Extraordinary Form)

The Verdelot “Agnus Dei” gets better and better the more we explore its treasures.

Jeff Ostrowski · August 4, 2015

My Response To “Should Church Singers Be Paid?”

“The labourer is worthy of his hire.” (I Tim 5:18)

Jeff Ostrowski · August 4, 2015

The Easiest Way To Teach Your Choir Polyphony

What could be simpler or more fun than this?

Jeff Ostrowski · August 4, 2015

Why St. Josemaría Escrivá Only Celebrated The Extraordinary Form

“Such moments had been a part of his spiritual life since boyhood and through his priesthood.”

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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

Last Fall, however, the bishop of Augsburg in West Germany, the Most Rev. Josef Stimpfle, ordered all parishes in his diocese to have a Latin High Mass at least once a month. This policy drew a letter of warm commendation from the apostolic nuncio to West Germany, Archbishop Guido del Mestri, who termed the decree “exemplary” and added, “The way chosen by you is one desired by the whole Church.”

— Latin Liturgy Association “Newsletter” (September 1980)

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