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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

PDF Download • “Credo III + Polyphonic Extension”

Jeff Ostrowski · January 17, 2024

OR MANY YEARS, I had no idea how to use the Gregorio software (a.k.a. “GABC”) to instantly create plainsong scores on the computer. When I couldn’t take it anymore, I called up a friend and paid him $150 to teach me over the telephone. I was able to learn only with assistance from a living, breathing human being. Thanks to his assistance, I can now create Gregorian Chant scores with ease. That $150 was not wasted. Some things in life (in my humble opinion) cannot be learned from books—and that’s why I recently recorded a special seminar: Secrets of the Conscientious Choirmaster.

Contrafactum • Nothing is hard if you know how to do it. Men who spent their entire lives tinkering with automobiles and tractors have no problem repairing cars—because they know what to do! In my seminar, I give away secrets I’ve picked up over the last 25 years (working with hundreds of singers across the United States). One technique I really “hammer” or “emphasize” or “highlight” is that of CONTRAFACTUM. I don’t see how anyone could run a choral program without it. Mozart used it. Handel used it. Bach used it. Even Father Cristóbal de Morales (d. 1553) used CONTRAFACTUM when he wrote alternate movements for his magnificent Missa Mille Regretz.

Choral Extensions • I also delve into the concept of “choral extensions” during my seminar. To give you an example, yesterday afternoon I quickly threw together—thanks to the Missa Mille Regretz by Father Cristóbal de Morales—a “polyphonic extension” using CREDO III:

*  PDF Download • “CREDO III + Polyphonic Extension”
—Using Missa Mille Regretz by Father Cristóbal de Morales.

What We Did • Several of my choir members helped me record it—so you can get a rough idea how the “choral extension” sounds:

Free rehearsal videos for each individual voice await you at #34648.

Jeff’s Sadness:

Free rehearsal tracks for each individual voice are available at that link, but most readers won’t click on it—and that makes me feel depressed. They take forever to create, but the choirmasters who utilize them testify they’re worth their weight in gold.

P.S.
Father Morales does some nifty things in that polyphonic “Et Incarnatus Est.” You can learn more if you watch the INTRODUCTION (51 minutes) which is available free of charge.

Opinions by blog authors do not necessarily represent the views of Corpus Christi Watershed.

Filed Under: Articles, Featured, PDF Download Tagged With: Creating Gregorian Chant GABC, GABC Gregorian Chant, Gregorio (software), Gregorio Computer Plainsong, Gregorio Fonts Plainchant, Missa Mille Regretz, Polyphonic Credo Extensions Last Updated: January 17, 2024

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About Jeff Ostrowski

Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He resides with his wife and children in Michigan. —(Read full biography).

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Corpus Christi Watershed

President’s Corner

    PDF Download • “Organ Accompaniment”
    Over the past few years, I’ve been harmonizing all the vernacular plainsong Introit settings by the CHAUMONOT COMPOSERS GROUP. This coming Sunday—10 May 2026—is the 6th Sunday of Easter (Year A). The following declaration will probably smack of “blowing my own horn.” However, I’d rank this accompaniment as my best yet. In this rehearsal video, I attempt to sing it while simultaneously accompanying myself on the pipe organ. The musical score [for singers] as well as my organ accompaniment can be downloaded free of charge from the flourishing feasts website.
    —Jeff Ostrowski
    “Gregorian Chant Quiz” • 4 May 2026
    A few days ago, the CORPUS CHRISTI WATERSHED Facebook page posted this Gregorian Chant quiz regarding a rubric for the SEQUENCE for the feast of Corpus Christi: “Lauda Sion Salvatórem.” There is no audience more intelligent than ours—yet surprisingly nobody has been able to guess the rubric. Drop me an email with the right answer, and I’ll affirm your brilliance to everyone I encounter!
    —Jeff Ostrowski
    “Rare Photographs” • Hannibal Bugnini
    On 2 September 2025, we included in this article extremely rare photographs of Archbishop Hannibal Bugnini taken in Iran circa 1979. Bugnini had initially been banished by the pope to Uruguay, but he refused to obey. [This is interesting, since Bugnini relied upon ‘blind obedience’ when it came to modifications of the ancient liturgy.] After he refused to obey the order from the pope, Hannibal Bugnini was banished to Iran. You can also watch a short video of Hannibal Bugnini in Iran, dated 10 November 1979. That’s about a week after the USA embassy hostage crisis began in Tehran, and Pope Saint John Paul II had sent the leader of the Iranian Revolution a special letter.
    —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

“Now we are aware of the fact that during recent years some artists, gravely offending against Christian piety, have dared to bring into churches works devoid of any religious inspiration and completely at variance with the right rules of art.”

— Ven. Pope Pius XII (25 December 1955)

Recent Posts

  • PDF Download • “Organ Accompaniment”
  • “Gregorian Chant Quiz” • 4 May 2026
  • “Rare Photographs” • Hannibal Bugnini
  • “Regina Caeli” • More Than You Wanted To Know
  • Music List • “5th Sunday of Easter” (Year A)

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