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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 • Organ Accompaniment for Kyrie VIII (“Missa de Angelis”) by Jeff Ostrowski

Jeff Ostrowski · August 23, 2022

HE FAMOUS “Mass of the Angels” (Missa de Angelis) often gets a bum rap. It’s certainly the most well-known Mass, and in the 19th century missions, it was sung in Iroquoian. People usually condemn it as being “too reminiscent modern tonality.” Even Dr. Peter Wagner placed it in the category of cantus recentiores. In reality, however, the Kyrie comes from the 1300s. The Sanctus and Agnus Dei are fairly ancient, too. They appear to be ‘contrafact’ settings of O Quam Suavis Est. (At the end of this article, I show some examples of that antiphon.) Anyone who’s skeptical is invited to examine this color-coded chart.

My Favorite Harmonization • Inspired by the great Flor Peeters, I have written an accompaniment for Kyrie VIII. In general, I move the bass-line downwards (stepwise) as the melody in the soprano rises.  I hope you like it:

*  PDF Download • Kyrie VIII (Jeff Ostrowski)
—Kyrie from “Missa de Angelis” harmonized by Jeffrey Ostrowski.

Here’s the direct URL link.

That recording was made yesterday, which was the very first day our choir has returned. I think we’re going to have an awesome choral season!

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

Filed Under: Articles, Featured, PDF Download Tagged With: Amédée Gastoué d 1943, Dom Josef Pothier, Dr Peter Wagner Gregorian, Kyrie VIII, Mass of the Angels, Missa de angelis, Missa dicta de Angelis, O Quam Suavis Est Last Updated: January 10, 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

    Which Mass?
    In 1905, when the Vatican Commission on Gregorian Chant began publishing the EDITIO VATICANA—still the Church’s official edition— they assigned different Masses to different types of feasts. However, they were careful to add a note (which began with the words “Qualislibet cantus hujus Ordinarii…”) making clear “chants from one Mass may be used together with those from others.” Sadly, I sometimes worked for TLM priests who weren’t fluent in Latin. As a result, they stubbornly insisted Mass settings were ‘assigned’ to different feasts and seasons (which is false). To understand the great variety, one should examine the 1904 KYRIALE of Dr. Peter Wagner. One should also look through Dom Mocquereau’s Liber Usualis (1904), in which the Masses are all mixed up. For instance, Gloria II in his book ended up being moved to the ‘ad libitum’ appendix in the EDITIO VATICANA.
    —Jeff Ostrowski
    Like! Like! Like!
    You won’t believe who recently gave us a “like” on the Corpus Christi Watershed FACEBOOK PAGE. Click here (PDF) to see who it was. We were not only sincerely honored, we were utterly flabbergasted. This was truly a resounding endorsement and unmistakable stamp of approval.
    —Jeff Ostrowski
    PDF Download • “Atténde Dómine”
    Although it isn’t nearly as ancient as other hymns in the plainsong repertoire, Atténde Dómine, et miserére, quía peccávimus tíbi (“Look down, O Lord, and have mercy, for we have sinned against Thee”) has become one of the most popular hymns for LENT—perhaps because it was included in the famous Liber Usualis of Solesmes. This musical score (PDF file) has an incredibly accurate version in English, as well as a nice version in Spanish, and also the original Latin. Although I don’t claim to have a great singing voice, this morning I recorded this rehearsal video.
    —Jeff Ostrowski

Quick Thoughts

    Extreme Unction
    Those who search Google for “CCCC MS 079” will discover high resolution images of a medieval Pontificale (“Cambridge, Corpus Christi College, MS 079”). One of the pages contains this absolutely gorgeous depiction of the Sacrament of Extreme Unction.
    —Corpus Christi Watershed
    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

“Victoria not only made his professional debut as church organist: he also continued active on the organ bench until the very eve of his death. Indeed, during his last seven years at Madrid (1604-1611) he occupied no other musical post but that of convent organist.”

— Dr. Robert Stevenson (1961)

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