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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

William Mahrt Gregorian Chant

Andrea Leal · May 28, 2025

“The Adalbert Propers” • Six (6) Quotations

“Fewer than 1% of Catholics are able to answer these questions correctly.” —Andrea Leal

Jeff Ostrowski · January 22, 2025

“Remembering William Mahrt” • My interview with Dr. Horst Buchholz (21 January 2025)

Includes Dr. Buchholz’s obituary for William Mahrt: “A Gentleman, a Scholar, and a Friend”

Fr. David Friel · January 2, 2025

In Memoriam • Dr. William Mahrt

A brilliant and faithful man who had tasted heaven in the chants of the Church

Jeff Ostrowski · November 8, 2021

Missa “My Little Pony” by Dan Schutte • Its Pedigree

A USCCB statement: singing psalms at Mass “may create problems” … ?

Follow the Discussion on Facebook

Fr. David Friel · May 9, 2021

Virtual Sacred Music Colloquium 2021

Alongside many familiar faces, several new presenters are joining the faculty this year.

Follow the Discussion on Facebook

Fr. David Friel · October 12, 2020

Sacred Music Boot Camp 2020

Three days of practical chant instruction and immersion in the treasury of Catholic sacred music

Follow the Discussion on Facebook

Fr. David Friel · June 11, 2020

Virtual Sacred Music Colloquium 2020

The CMAA will offer a virtual version of its annual, week-long workshop.

Follow the Discussion on Facebook

Fr. David Friel · September 8, 2019

PDF Download • Chant Notation—Nuptial Blessing (EF)

With permission from the CDF, the nuptial blessing at a sung EF Mass may be chanted according to this melody.

Fr. David Friel · August 30, 2015

Society for Catholic Liturgy Conference 2015

Featuring Archbishop Salvatore Cordileone, Dr. William Mahrt, and Fr. Uwe Michael Lang

Jeff Ostrowski · February 4, 2015

Exclusive Interview With Dr. William Mahrt

Towards the end I ask the CMAA president a loaded question … and he answers!

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Corpus Christi Watershed

President’s Corner

    Music List • “5th Sunday of Easter” (Year A)
    Readers have expressed interest in seeing the ORDER OF MUSIC I created for the 5th Sunday of Easter Sunday—a.k.a. “Dominica V Paschae”—which is 3 May 2026. Please feel free to download it as a PDF file if such a thing interests you. The COMMUNION (“Tanto Témpore Vobíscum Sum”) is rather somber, with awesome fauxbourdon psalm verses. The ENTRANCE CHANT is bright and happy.
    —Jeff Ostrowski
    PDF Download • Communion for Sunday
    The COMMUNION ANTIPHON with fauxbourdon psalm verses for this coming Sunday (3 May 2026) is elegant and poignant. It’s such a shame it only comes every three years. This piece—along with all the musical scores for this coming Sunday, which is the 5th Sunday of Easter (Year A)—can be downloaded free of charge from the flourishing feasts website. By the way, how is it already 2026?
    —Jeff Ostrowski
    Season’s End Repertoire
    Looking at the REPERTOIRE SHEET until the end of the choral season, I see that I’ve fallen behind schedule. (The last three months have been extraordinarily busy.) As you know, I have been providing organ harmonies for all the ENTRANCE CHANTS—as well as rehearsal videos—and you can see I’m behind where I planned to be. Now I must make up lost ground. However, the choir picks up the ENTRANCE CHANT with ease, so I’m sure it will all work out. My ‘unofficial’ harmonizations are being posted each week at the flourishing feasts website.
    —Jeff Ostrowski

Quick Thoughts

    PDF Download • “Anima Christi”
    I received a request for an organ accompaniment I created way back in 2007 for the “Anima Christi” Gregorian Chant. You can download this PDF file which has the score in plainsong followed by a keyboard accompaniment. Many melodies have been paired with “Anima Christi” over the centuries, but this is—perhaps—the most common one.
    —Jeff Ostrowski
    PDF • “Liturgical Law” (467 Pages)
    On Good Friday during the middle ages, the pope privately recited THE ENTIRE PSALTER. If you don’t believe me, see for yourself by reading this passage by Dom Charles Augustine Bachofen (d. 1943). His famous book—called “Liturgical Law: A Handbook Of The Roman Liturgy”—was published by the Benjamin Herder Book Company, which was the American arm (operating out of St. Louis, Missouri) of one of the world’s most significant Catholic publishers. Dom Charles Augustine Bachofen was born in Switzerland but spent his career between the Benedictine monasteries at Conception (Missouri) and Mount Angel (Oregon). His 1931 masterpiece, Liturgical Law can be downloaded as a PDF file … 467 pages!
    —Jeff Ostrowski
    “Gregorian Chant Quiz” • 24 March 2026
    How well do you know your Gregorian hymns? Do you recognize the tune inserted into the bass line on this score? For many years, we sang the entire Mass in Gregorian chant—and I mean everything. As a result, it would be difficult to find a Gregorian hymn I don’t recognize instantly. Only decades later did I realize (with sadness) that this skill cannot be ‘monetized’… This particular melody is used for a very famous Gregorian hymn, printed in the LIBER USUALIS. Do you recognize it? Send me an email with the correct words, and I promise to tell everybody I meet about your prowess!
    —Jeff Ostrowski

Random Quote

“Angularis fundamentum” is typically sung at the dedication or consecration of a church and on church anniversaries. For constructions too numerous to list in recent generations, it would be more appropriate to sing that Christ had been made a temporary foundation. A dispirited generation built temporary housing for its Lord, and in the next millnenium, the ease of its removal may be looked back upon as its chief virtue.

— Fr. George Rutler (2016)

Recent Posts

  • “Regina Caeli” • More Than You Wanted To Know
  • Music List • “5th Sunday of Easter” (Year A)
  • PDF Download • Communion for Sunday
  • “Translating the Bible” • Msgr. Ronald Knox (1953)
  • Season’s End Repertoire

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