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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 · February 2, 2016

PDF Download • Simple Pieces For Roman Catholic Church Choirs (345 Pages)

First published in 1901 by Emile Dethier, organist at the Grand Seminary in Liège, Belgium.

Jeff Ostrowski · January 31, 2016

Musical Resources • Sexagesima Sunday (EF)

“Grant, we humbly beseech Thee, almighty God, that those whom Thou refreshest with Thy sacraments…”

Jeff Ostrowski · January 26, 2016

Chosen Your Easter Alleluia Yet?

It’s time—and here’s one you’ll love.

Jeff Ostrowski · January 26, 2016

Not Your Grandmother’s Creed

Composer David Haas posted a striking proclamation on his Facebook page.

Jeff Ostrowski · January 24, 2016

Musical Resources • Septuagesima Sunday (Extraordinary Form)

Yet the laborer called at the eleventh hour does not taste the joy reserved to one who has “worked and suffered without reckoning the hours.”

Jeff Ostrowski · January 19, 2016

| Part 3 of 3 | • “Kyrie Eleison” (SATB) within the reach of any choir!

Only one word describes Guerrero’s musical genius: fearsome.

Jeff Ostrowski · January 17, 2016

The Pope Who Had … A Child?

Then the Pope declared that it was the motet’s words—not its melody—which annoyed him.

Jeff Ostrowski · January 17, 2016

Musical Resources • 2nd Sunday after Epiphany (Extraordinary Form)

“Sanctify, O Lord, the gifts we offer, and purify us from the stains of our sins…”

Jeff Ostrowski · January 14, 2016

Staggering Canonic Setting • “Gloria” from Mass III

By the French Roman Catholic composer, Raphaël Mercier (d. 1953).

Jeff Ostrowski · January 11, 2016

Ludwig Passini: “Canons in the Church of St. Peter”

Their garments resemble the “winter” cappa magna.

Jeff Ostrowski · January 11, 2016

Gregory Ceurvorst Harmonizing The Chabanel Psalms

I saw something cool on YouTube.

Jeff Ostrowski · January 9, 2016

Musical Resources • Feast of the Holy Family (Extraordinary Form)

“O Lord Jesus Christ, who—in the days of thy sub­jec­tion to Mary and Joseph—didst consecrate home life by ineffable acts of virtue…”

Jeff Ostrowski · January 9, 2016

Letter To The FSSP Choir In Los Angeles

There’s something less scary you can do to help build up God’s Kingdom.

Jeff Ostrowski · January 9, 2016

VIDEO • Archbishop Fulton J. Sheen & William F. Buckley

In 1971, Sheen appeared on “Firing Line” and spoke about St. Augustine.

Jeff Ostrowski · January 8, 2016

The Miraculous Rise Of The Traditional Latin Mass

A puzzling article appeared in the National Catholic Register by Msgr. Charles Pope.

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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

“The council did not say Latin should be abolished. It said Latin should be used. […] While at Ecclesia Dei, I once received a letter from a chancery office in the United States, asking me if I didn’t know that the council had abolished Latin!”

— Cardinal Mayer, Prefect (1985–1988) of the Vatican’s Congregation for Divine Worship

Recent Posts

  • “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
  • Solfege Volleyball: A Children’s Choir Game

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