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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 · June 3, 2022

Revelation • “Re: The Official Rhythm”

A very intelligent singer admitted that only yesterday did he finally come to understand what a “melismatic mora vocis” is. Only yesterday did he come to understand the “white notes” (blank spaces). You can see the Introit for Pentecost Sunday only has two instances of MMV (“melismatic mora vocis”).

Jeff Ostrowski · June 3, 2022

3 June 2022 • FEEDBACK

From Saint Petersburg, Florida: “Thank you so much for all of your tireless and selfless work in building up the Kingdom of God and Helping us on the path toward heaven! Your work for many years now has borne much fruit in my life and in the lives of whom I work with. May the […]

Jeff Ostrowski · June 1, 2022

1 June 2022 • FEEDBACK

From Pennsylvania: “Thank you for all of the music on your website! It has been of immense help to me as a choir director.” From Minnesota: “Thank you for your awesome ministry! I started going to a Latin mass parish about 10 years ago, and this website has been indispensable to me. I could not […]

Jeff Ostrowski · May 28, 2022

28 May 2022 • “Pristine” Vatican Rhythm

My choirs have been singing from the “pure” Editio Vaticana rhythm, which is (technically) the official rhythm of the Catholic Church. I haven’t quite decided how I want the scores to look yet, but this one I’ve produced for tomorrow, Dominica Post Ascensionem (“Sunday after the Ascension”).

Jeff Ostrowski · May 27, 2022

27 May 2022 • FEEDBACK

A reader from Wisconsin: “I will pray for you and CC Watershed. This site has been one of the most valuable resources I have in helping me run a choir for an ICKSP apostolate.” A reader from New York: “May God bless you for your wonderful work! This site has been invaluable to me.” A […]

Jeff Ostrowski · May 25, 2022

25 May 2022 • FEEDBACK

From a reader: “I can’t tell you how much I appreciate all the time and resources poured into CCWatershed. It’s transformed how I approach music in the parish, and has especially helped me deepen appreciation for the ability of volunteer musicians.”

Jeff Ostrowski · May 24, 2022

23 May 2022 • FEEDBACK

From a reader: “I wasn’t looking for it. But, I stumbled across your hand-dandy arrangement of Pachelbel’s Canon. Jeff, this is the greatest thing since sliced bread! I had to play a wedding on Saturday. The bride requested the Canon. There were 11 bridesmaids! The organ loft is a football field away from the communion […]

Jeff Ostrowski · May 19, 2022

19 May 2022 • “Trochee Trouble”

I’m still trying to decide how to visually present the “pure” Editio Vaticana scores, using what is (technically) the official rhythm of the Church. You can download my latest attempt, for this coming Sunday. Notice the “trochee trouble” as well as the old issue of neumes before the quilisma.

Jeff Ostrowski · May 16, 2022

16 May 2022 • Harmonized Chant?

This year’s upcoming Sacred Music Symposium will demonstrate several ways to sing the CREDO at Mass. This is because—for many parishes—to sing a full-length polyphonic CREDO by Victoria or Palestrina is out of the question. Therefore, we show options that are halfway between plainsong and polyphony. You can hear my choir rehearsing a section that […]

Jeff Ostrowski · May 14, 2022

14 May 2022 • “Pure” Vatican Edition

As readers know, my choir has been singing from the “pure” Editio Vaticana. That is to say, the official rhythm which—technically—is the only rhythm allowed by the Church. I haven’t figured out how I want the scores to look, so in the meantime we’ve been using temporary scores that look like this. Stay tuned!

Jeff Ostrowski · May 14, 2022

14 May 2022 • Gorgeous Book

If there is a more beautiful book than Abbat Pothier’s 1888 Processionale Monasticum, I don’t know what it might be. This gorgeous tome was today added to the Saint John Lalande Online Library. I wish I owned a physical copy.

Jeff Ostrowski · May 3, 2022

Sound Familiar?

1 June 1579: “The chapter passes a rule that anyone ascending to the new organ without official permission shall be fined a month’s pay.” 26 October 1579: “The altar boys remain always separate and distinct from choirboys—the one group learning only plainchant and assisting at the altar, the other living with the chapel-master and studying […]

Jeff Ostrowski · April 25, 2022

Choirs Love This Piece!

Back in 2001, I created an arrangement of “O Filii Et Filiae” based on the work of Monsignor Jules Van Nuffel. You can access free rehearsal videos at #5909. Choirs absolutely love singing this piece. You can hear my volunteer choir singing a live recording.

Jeff Ostrowski · April 14, 2022

Holy Thursday Introit • “Pure” Vaticana

Many people wonder what Cantus Gregorianus sounds like when sung according to the “official rhythm.” You can hear the Introit for Maundy Thursday sung that way—i.e. according to the “pure” Editio Vaticana—if you click here. Technically, this is the only interpretation allowed by the Church; cf. the letter of Cardinal Martinelli (18 February 1910).

Jeff Ostrowski · April 12, 2022

“Ah, Holy Jesus, How Hast Thou Offended?”

A wonderful passiontide hymn is #692 in the Brébeuf hymnal. It works especially well for Communion. Here is a live recording from last Sunday, sung by the fabulous female singers in my volunteer parish choir.

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Corpus Christi Watershed

President’s Corner

    PDF Download • Introit (2nd Sn. Ord.)
    This coming Sunday, 18 January 2026, is the 3rd Sunday in Ordinary Time (Year A). The ENTRANCE CHANT is set according to the fourth mode, which sounds ‘serious’ or ‘dark’ or ‘haunting’ or ‘mysterious’—and its English adaptation corresponds to the authentic version (“Omnis terra adóret”) found in the GRADUALE ROMANUM. In this rehearsal video (click here) I attempt to sing the melody while simultaneously accompanying myself on the organ. I encourage you to print off the organ accompaniment (PDF) and play through it, because the harmonies are delightful.
    —Jeff Ostrowski
    Spectacular Communion Setting!
    The FAUXBOURDON setting of the Communion for the Baptism of the Lord (which will occur this coming Sunday) strikes me as quite spectacular. The verses—composed by the fifth century Christian poet, Coelius Sedulius—come from a long alphabetical acrostic and are deservedly famous. The feast of the LORD’S BAPTISM was traditionally the octave day of Epiphany, but in the 1962 kalendar it was made ‘more explicit’ or emphasized. The 1970 MISSALE ROMANUM elevated this feast even further.
    —Jeff Ostrowski
    PDF • “Music List” (Sunday, 11 January)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for Feast of the Baptism of the Lord (SUNDAY, 11 January 2025). If such a thing interests you, feel free to download it as a PDF file. The FAUXBOURDON verses for the Communion Antiphon—to say nothing of the antiphon itself—are breathtaking. As always, the Responsorial Psalm, Gospel Acclamation, and Mass Propers for this Sunday are available at the monumental feasts website alongside the official texts in Latin.
    —Jeff Ostrowski

Quick Thoughts

    “Reminder” — Month of January (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. Signing up couldn’t be easier: simply scroll to the bottom of any blog article and enter your email address.
    —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
    PDF Download • “In Paradisum” in English
    We always sing the IN PARADISUM in Latin, as printed on this PDF score. I have an appallingly bad memory (meaning I’d be a horrible witness in court). In any event, it’s been brought to my attention that 15 years ago I created this organ accompaniment for the famous and beautiful ‘IN PARADISUM’ Gregorian chant sung in English according to ‘MR3’ (Roman Missal, Third Edition). If anyone desires such a thing, feel free to download and print. Looking back, I wish I’d brought the TENOR and BASS voices into a unison (on B-Natural) for the word “welcome” on the second line.
    —Jeff Ostrowski

Random Quote

In the ’60s, I thought this emphasis on congregational singing was to encourage good Catholic hymns like “Immaculate Mary” and so forth … but after the Council, they threw them out, too!

— ‘Fr. Valentine Young, OFM (2007)’

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