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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

Medieval Manuscripts

Jeff Ostrowski · November 18, 2024

High Resolution Scan • “Missale Romanum” (1857)

This rare missal from 1857 contains some musical notes.

Corpus Christi Watershed · December 25, 2021

“Merry Christmas!” • From Our Family To Yours

Dear readers, thank you for everything!

Jeff Ostrowski · May 12, 2021

Being Too Hard On Priests?

…including a fancy capital “A” from a medieval manuscript.

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Jeff Ostrowski · April 4, 2021

(Hymn) • “Jesus Christ Is Risen Today”

…including rehearsal videos for each individual voice.

Jeff Ostrowski · March 19, 2021

Saint Joseph + Baby Jesus In A Walker

This luscious manuscript was created about A.D. 1453 for a French Noblewoman.

Jeff Ostrowski · March 4, 2021

Now Online! • “Missale Romanum” (1615 edition)

How ironic that this is being hosted by the Martin Luther University!

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Jeff Ostrowski · August 28, 2020

“Resplendent Beyond Reckoning” • Sherborne Missal (1399AD)

As the Isaac Jogues Missal would do 650 years later, this Missal provides pictures of the priest during the Canon!

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Jeff Ostrowski · January 15, 2020

What Palestrina Did With Kyrie II (“Fons Bonitatis”)

Many erroneously believe the Kyrie was the only thing troped, but that’s not even close to true.

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Jeff Ostrowski · October 10, 2019

Incredible!!! • Ancient Kyriale MSS for Download

Through the centuries, we observe a remarkable stability—in spite of variants, which will always exist.

Jeff Ostrowski · September 20, 2017

PDF Download • “Missal for the Laity” (1846)

Have you noticed liturgical progressives are never happy?

Jeff Ostrowski · July 6, 2015

The Beauty Of Ancient Catholic Manuscripts

Medieval manuscripts were normally created by (at least) two monks: one drew, one wrote.

Jeff Ostrowski · April 6, 2015

Jaw-Dropping Liturgical Manuscripts (7,055 Pages)

Catholics can now *see with their own eyes* the antiquity of our liturgy.

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Corpus Christi Watershed

President’s Corner

    “Sanctus VIII” • Organ Accompaniment
    A few days ago, I composed this organ harmonization for SANCTUS VIII. This Mass is traditionally called Missa de ángelis or “Mass of the angels.” In French, it is Messe de Anges. You can evaluate my attempt to simultaneously accompany myself on the pipe organ (click here) while singing the melody. My parish is currently singing this setting.
    —Jeff Ostrowski
    Music List • (5th Sund. Ordinary Time)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for this coming Sunday, 8 February 2026, which is the 5th Sunday in Ordinary Time (Year A). If such a thing interests you, feel free to download it as a PDF file. You will probably notice it isn’t as ‘complete’ or ‘spiffy’ as usual, owing to some difficulties which took place this week.
    —Jeff Ostrowski
    PDF • “Communion” (5th Sunday in Ordin.)
    The COMMUNION ANTIPHON for this coming Sunday, 8 February 2026—which is the 5th Sunday in Ordinary Time (Year A)—is truly delightful. You can download the musical score completely free of charge. This text will be familiar to altar boys, because it’s PSALM 42. The Feder Missal makes the following claim about that psalm: “A hymn of a temple musician from Jerusalem: he is an exile in a heathen land, and he longs for the holy city and his ministry in the Temple there. The Church makes his words her own.”
    —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

He stood firm against nepotism, rebuking his predecessor Pope Pius IV to his face when he wanted to make a 13-year-old member of his family a cardinal and subsidize a nephew from the papal treasury.

— Re: Pope Saint Pius V (d. 1572)

Recent Posts

  • Pope Paul VI • “Sacrificum Laudis” (15 Aug 1966)
  • “Sanctus VIII” • Organ Accompaniment
  • PDF Download • Sanctus VIII Organ Accompaniment (“Mass of the Angels”)
  • Gorgeous Image of Monks Singing!
  • “Let the Choir Have a Voice” • Jeff Ostrowski’s Essay on Choral Music in the Catholic Mass

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