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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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Emporium Kevin Allen • Official Site

Emporium Kevin Allen • Official Site

EVIN ALLEN has been highly regarded as a composer of opera, chamber and orchestral music. He has also developed a unique reputation as a composer of church music for the Roman Rite. By popular demand, his works are now being made available in EMPORIUM KEVIN ALLEN. Mr. Allen’s works, sacred and secular, have been performed in churches and concert halls throughout the United States and Europe. He is the founding director of the Collins Consort, the American Composer’s Project, and the Schola Immaculata. Mr. Allen is also the choirmaster of the Monastery of the Holy Cross in Chicago.

🔴 Available on Amazon as of 29 June 2025:
Hymns of John Henry Cardinal Newman: Kevin Allen’s Legendary Choral Settings

+  STOWE MISSAL EUCHARISTIC MOTETS (SAB)
—For Soprano, Alto, and Bass • 28-page book • This is Volume 1 (additional volumes will be released each year) • These pieces employ the ancient communion texts from the 7th-century STOWE MISSAL.

+  MATRI DIVINAE GRATIAE (SAB)
—Simple pieces for Soprano, Alto, and Bass • sample page • 42-page book.

+ MISSA FIDELIS SERVUS
—SATB; A Cappella; Kyrie, Gloria, Credo, Sanctus, Agnus Dei • 25-page book.

+  MISSA NUN KOMM DER HEIDEN HEILAND
—SATB • Kyrie, Gloria, Sanctus & Hosanna, Benedictus & Hosanna, Agnus Dei • sample page • 12-page book.

+  MISSA AD TE LEVAVI
—SSA • Kyrie, Credo, Sanctus & Hosanna, Benedictus & Hosanna, Agnus Dei • sample page • 17-page book.

+  MISSA CHRISTUS REX
—SATB with Organ • Kyrie, Gloria, Sanctus & Hosanna, Benedictus & Hosanna, Agnus Dei • sample page • 24-page book.

+  MISSA PRO DEFUNCTIS QUINQUE VOCUM
—“Mass for the Dead” for SSATB chorus, a cappella • 55-page book • Requiem Mass.

+  MISSA BREVIS
—“Missa Brevis” for SATB chorus, a cappella • 13-page book.

+  MISSA ORBIS FACTOR
—For Treble Chorus, Chant Schola, and Strings Conductor’s Score (Full Score) with String parts (Violin I, Violin II, Viola, Violoncello, Contrabass) • 42-page book.
MMM Note: For “Missa Orbis Factor,” the Schola and Treble Chorus will sing from The Rehearsal Score (which has piano reduction).

+  MISSA REX GENITOR
—Mass for three equal voices • 25-page book • 34 practice videos by Matthew J. Curtis.

+  CANTIONES SACRAE II
—Fifteen SATB motets • 55-page book • includes the famous “Tantum Ergo” which opens Sacred, Beautiful, & Universal • 15 free practice videos by Matthew J. Curtis.

+  MISSA REX SPLENDENS
—Mass for SA chorus, chant schola, & organ • 30-page book • based on Gregorian Chant Mass VII in the Kyriale.

+  “I Sing of a Maiden”
—SATB + ORGAN • 8 pages long.

+  MOTECTA TRIUM VOCUM
—Twelve (12) motets for three equal voices • 64-page book • includes optional Psalms in Latin & English • more than 56 free practice videos by Matthew J. Curtis.

+  Missa de Beata Virgine • SATB Chorus A Cappella
—34 pages; Kyrie, Gloria, Credo, Sanctus, Hosanna, Benedictus, Hosanna, Agnus Dei.

+  CANTIONES SACRAE SIMPLICES (SATB)
—Twelve simple SATB motets • 84-page book • includes optional Psalms in Latin & English • more than 150 free practice videos by Matthew J. Curtis • Foreword by Dr. William Mahrt • Hear a live recording of one of these motets sung at the Vatican by the choir of the Sistine Chapel.

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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

    “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
    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

Random Quote

“The Night Office—Nocturns or Matins—except for Holy Week, Easter Octave, and Christmas, has never appeared in the Vatican edition. The larger part of the mediaeval repertory for the Office thus remains still unpublished in the Vatican edition, and is likely to remain so, for the obvious reason that almost no cathedral chapters or monastic choirs sing the Night Office regularly today.”

— John Merle Boe (1968)

Recent Posts

  • “Reminder” — Month of May (2026)
  • “Englished” Gregorian Chant • 5 Considerations
  • Simplified Version • “Canon in D” (Pachelbel)
  • PDF Download • “Organ Accompaniment”
  • “Gregorian Chant Quiz” • 4 May 2026

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