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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 · July 20, 2016

PDF Download • St. Cecilia Hymnal (1937)

Like all the books we release, this extremely rare hymnal was previously unavailable until we scanned and uploaded it.

Jeff Ostrowski · July 17, 2016

Showdown in Arkansas over “Ad Orientem”

The Bishop of Little Rock has sent a letter (14 July 2016) forbidding his priests to celebrate Mass “ad orientem.”

Jeff Ostrowski · July 16, 2016

Musical Resources • 9th Sunday after Pentecost

“…and that Thou mayest grant their desires to them, make them ask only for things that please Thee…”

Jeff Ostrowski · July 13, 2016

Shocking Developments From Westminster

If Cardinal Nichols had simply sent a letter saying why he prefers “versus populum,” I believe that would have been a better choice.

Jeff Ostrowski · July 13, 2016

SATB “Agnus Dei” after Fr. Gregorio Allegri (d. 1652)

Without question, the most popular piece I ever “wrote.”

Jeff Ostrowski · July 12, 2016

Did Fr. Lombardi Contradict Cardinal Sarah?

Perhaps a better phrase would be Bishop Gracida’s version: “Renewal of the Renewal.”

Jeff Ostrowski · July 9, 2016

“Quam Singulari” • Decree on First Communion (1910)

Pope St. Pius X wanted this decree to be read each year from the pulpit by all Catholic priests.

Jeff Ostrowski · July 6, 2016

Sensational Hymn for St. Joseph … with Modern Polyphony!

We’ll be singing this piece a lot because our priest has a special devotion to St. Joseph.

Jeff Ostrowski · July 2, 2016

“Confiteor” Before Communion • Should It Be Done?

Six reasons in favor of the “Second Confiteor” and my thoughts.

Jeff Ostrowski · June 29, 2016

“Salve Virgo Singularis” • For Three Voices

I cannot imagine a more powerful text.

Jeff Ostrowski · June 27, 2016

Wow! Take 35% off your purchase!

The Goupil Graduals arrived this morning, and they look marvelous!

Jeff Ostrowski · June 27, 2016

Audio Samples • Can A Volunteer Choir Sing Excellent Music At Mass?

If you think we weren’t nervous to sing before so many … think again!

Jeff Ostrowski · June 24, 2016

Los Angeles Pontifical Mass • This Coming Sunday!

We’ll be joined by Bishop Athanasius Schneider, our FSSP District Superior, and several FSSP seminarians for a Solemn Pontifical Mass in Hollywood.

Jeff Ostrowski · June 23, 2016

“I will fear no evils, for thou art with me.”

St. John Vianney was once overheard speaking directly to the Lord.

Jeff Ostrowski · June 22, 2016

Purchase Hard Copies of the Goupil Gradual

Eight reasons why every choirmaster needs this new resource.

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Corpus Christi Watershed

President’s Corner

    Music List • (2nd Sunday of Lent)
    Readers have expressed interest in seeing the ORDER OF MUSIC I created for this coming Sunday—1 March 2026—the 2nd Sunday of Lent (Year A). If such a thing interests you, feel free to download it as a PDF file. As always, the Responsorial Psalm, Gospel Acclamation, and Mass Propers for this Sunday are available at the flourishing feasts website alongside the official texts in Latin.
    —Jeff Ostrowski
    Particularly Beautiful
    The 2nd Sunday of Lent has magnificent propers. Its INTROIT is particularly striking—using a haunting tonality—but the COMMUNION with fauxbourdon verses is also quite remarkable. I encourage all the readers to visit the feasts website, where the Propria Missae may be downloaded completely free of charge.
    —Jeff Ostrowski
    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

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

“Finally, let us not forget that listening especially is active participation. When we listen to the performances of Bach’s Saint Matthew Passion, we can fully participate actively in the Passion of Christ. And so, if we listen attentively to the singing and organ music during the celebration of the divine services, our participation is not less complete. The real significance of this objective and very important aspect is insufficiently understood.”

— Flor Peeters

Recent Posts

  • Music List • (2nd Sunday of Lent)
  • Particularly Beautiful
  • PDF Download • “Funerals in the Ordinary Form”
  • Extreme Unction
  • Which Mass?

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