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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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President’s Corner

    Music List • “Ascension of the Lord”
    Readers have expressed interest in seeing the ORDER OF MUSIC I created for the The Ascension of the Lord—“Festum Ascensionis Domini”—which is transferred to 17 May 2026 in our diocese. Please feel free to download it as a PDF file if such a thing interests you. The OFFERTORY (“Ascéndit Deus in jubilatióne”) is particularly beautiful and the ENTRANCE CHANT is simply splendid. As always, readers may go directly to the flourishing feasts website, where the complete Propria Missae may be downloaded free of charge.
    —Jeff Ostrowski
    PDF Download • “For Pentecost Sunday”
    Yesterday morning, I recorded myself singing the ENTRANCE CHANT for Pentecost Sunday while simultaneously accompanying myself on the pipe organ. Click here to see how that came out. At the end of the antiphon, there’s a triple Allelúja and I just love the chord at the end of the 2nd iteration. The organ accompaniment—along with the musical score for singers—can be downloaded free of charge at the flourishing feasts website. For the record, the antiphon on Pentecost Sunday doesn’t come from a psalm; it comes from the book of Wisdom.
    —Jeff Ostrowski
    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

Quick Thoughts

    “Thee” + “Thou” + “Thine”
    Few musicians realize that various English translations of Sacred Scripture were granted formal approval by the USCCB and the Vatican for liturgical use in the United States of America. But don’t take my word for it! Here are four documents proving this, which you can examine with your own eyes. Some believe the words “Thine” and “Thou” and “Thee” were forbidden after Vatican II—but that’s incorrect. For example, they’re found in the English translation of the ‘Our Father’ at Mass. Moreover, the Revised Standard Version (Catholic Edition) mentioned in those four documents employs “Thine” and “Thou” and “Thee.” It was published with a FOREWORD by Westminster’s Roman Catholic Archbishop (John Cardinal Heenan).
    —Jeff Ostrowski
    “Reminder” — Month of May (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
    Simplified Version • “Canon in D” (Pachelbel)
    I published an article on 11 November 2023 called Wedding March For The Lazy Organist, which rather offhandedly made reference to a simplified version I created in 2007 for Pachelbel’s Canon. I often use it as a PROCESSIONAL for weddings and quinceañeras. Many organists say they “hate” Pachelbel’s Canon. But I love it. I think it’s bright and beautiful. I created that ‘simplified version’ for musicians coming to grips with playing the pipe organ. It can be downloaded as a free PDF if you visit Andrea Leal’s article dated 15 August 2022: Manuals Only: Organ Interludes Based on Plainsong. Specifically, it is page 84 in that collection—generously offered as a free PDF download. Johann Pachelbel (d. 1706) was a renowned German organist, violinist, teacher, and composer of over 500 works. A friend of Bach’s family, he taught Johann Christoph Bach (Sebastian Bach’s eldest brother) and lived in his house. Those who read Pachelbel’s biography will notice his connection to two German cities adopted as famous hymn tune names: EISENACH and ERFURT.
    —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)

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