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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

President's Corner

Jeff Ostrowski · January 18, 2024

Abbat Pothier on Gregorian Chant

“There is, then, in the Church, in the Catholic liturgy, a music that, as we have just stated, is both a word and a song, a music rich and powerful, although simple and natural, a music that is not self-seeking, which does not attend to itself but comes forth as the spontaneous utterance of religious […]

Jeff Ostrowski · January 12, 2024

Organ Accompaniment Booklet (25 pages)

Those who celebrate VESPERS each week may wish to download my organ accompaniment booklet (25 pages) for the 2nd Sunday after Epiphany. This was originally released about a year ago (link), but minor improvements have been made.

Jeff Ostrowski · January 11, 2024

Know your hymns? How Well?

Several singers from my choir recently recorded this beautiful hymn (Mp3), using famous lyrics from the Brébeuf Hymnal. How well do you know your hymns? Can you name that tune? If so, please email us. If you correctly name that tune, I’ll declare: “You really know your hymns!”

Jeff Ostrowski · January 8, 2024

Organ? Or SATB unaccompanied?

Pipe organ (with voices) or unaccompanied SATB? Which do you prefer? Yesterday at Mass, my volunteer choir gave you an opportunity to compare “apples to apples.” Simply click here and compare the first verse with the second. For the record, that melody is called by various names: ALTONA, VOM HIMMEL HOCH, ERFURT, and so on.

Jeff Ostrowski · January 8, 2024

Simple “Salve Regina” • Its Origins

In the past, I have attempted to determine the origins of the “simple” Salve Regina chant. When it comes to the so-called “restored” plainsong books, the earliest instance I can find (of the simple version) is in the LIBER RESPONSORIALIS, published in 1895, a marvelous book based upon the groundbreaking research of Dom Joseph Pothier. […]

Jeff Ostrowski · January 3, 2024

Do You Recognize This “Christmas” Tune?

Over the last 70 years, ST VENANTIUS has fallen out of favor. One reason might be that many harmonizations of it are “chunky.” I was pleased to see the Brébeuf Hymnal adopted the harmonization by Dom Gregory Murray (probably the finest ever created for ST VENANTIUS). This morning, I created this pipe organ recording. The […]

Jeff Ostrowski · December 31, 2023

PDF • January 1st (Organ Accomp. Booklet)

Anyone who wishes to may download the Organ Accompaniment Booklet (22 pages) I created for FIRST VESPERS of January 1st. That feast has various names, including “In Octava Nativitatis Domini.” These organ accompaniment booklets take forever to make!

Jeff Ostrowski · December 26, 2023

“Corde Natus Ex Parentis” (SATB)

A few minutes ago, I uploaded an English SATB version of “CORDE NATUS EX PARENTIS” (an ancient Christmas hymn by Prudentius). A nifty Latin version is also available. The quickest way to download either is to visit #668 in the Portal and scroll down to where it says: Additional information about Hymn 668. Many people […]

Jeff Ostrowski · December 15, 2023

Mandatory Advent Piece

Last Sunday, our volunteer choir sang “the mandatory piece” for ADVENT in these United States. Anyone interested can listen to the ‘live’ recording. The claim is sometimes made (erroneously) that this piece can be sung only during the final days of ADVENT. Such an assertion demonstrates a misunderstanding of where this piece came from and […]

Jeff Ostrowski · December 14, 2023

“Silent Night” • Easy Organ Arrangement

Here’s a handy organ accompaniment (PDF) in three different key signatures: MIDDLE, HIGH, and LOW. The Latin lyrics (“Silens Nox”) are courtesy of Father Valentine Young, OFM (d. 2020). The organ harmonies are very simple, yet beautiful. Those who desire such a thing may also download a Singer’s Version. Choirs will ‘pick up’ this piece […]

Jeff Ostrowski · December 13, 2023

Do You Recognize This Melody?

This morning, I attempted to record a hymn called BRISTOL. Click here to listen to what I produced. I’m trying to provide PIPE ORGAN RECORDINGS for any Brébeuf hymns which don’t (yet) have a choral recording. Thousands of rehearsal videos have been added—by real human voices—but there’s still more work to do. I know very […]

Jeff Ostrowski · December 12, 2023

“PPG” • Plainsong Progress by Girls

You can listen to this ‘live’ recording of females singing the INTROIT (“Pópulus Sýon”) last Sunday, which was the Second Sunday of Advent. I accompanied them softly on the pipe organ. I would like to remind everyone who listens: 100% of the singers in my choir are volunteers recruited from the congregation. Indeed, the two […]

Jeff Ostrowski · December 5, 2023

Schola Director Posts ‘Live’ Recording

As I explained in my article posted earlier today, Nun Komm Der Heiden Heiland is actually a Catholic tune (in spite of what some have claimed). The volunteer choir I direct sang that beautiful ADVENT melody last Sunday, and I invite you to listen to the live recording. It will get better the more we […]

Jeff Ostrowski · December 1, 2023

Message from the Vice-President!

The Vice-President of the Church Music Association of America, Dr. Horst Buchholz (who also serves as Director of Sacred Music for the Archdiocese of Detroit) sent us an email yesterday regarding the harmonizations (PDF) I composed for the Gregorian Chant psalm tones. Dr. Buchholz says: “Those settings are absolutely exquisite, as I’m used to when […]

Jeff Ostrowski · November 29, 2023

Requesting Our Advent Eucharistic Hymn

A young lady named Agnes wrote to us: “Dear Mr. Ostrowski, do you have the PDF score for Ave Corpus Domini set to the ADVENT melody? Last year, we sang the hymn tune “Nun Komm der Heiden Heiland” quite a bit using your contrafactum technique. My choir appreciates the Latin hymns and practice videos, especially […]

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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, which is the 2nd Sunday of Lent (1 March 2026). If such a thing interests you, feel free to download it as a PDF file. This feast has magnificent propers. Its somber INTROIT is particularly striking—using a haunting tonality—but the COMMUNION with its 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
    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
    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

Religious worship supplies all our spiritual need, and suits every mood of mind and variety of circumstance.

— John Henry Cardinal Newman

Recent Posts

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  • Extreme Unction
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