About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he lives with his wife and two children.
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"In accord with no. 55 of the instruction of the Congregation of Rites on music in the liturgy (March 5, 1967), the Conference of Bishops has determined that vernacular texts set to music composed in earlier periods may be used in liturgical services even though they may not conform in all details with the legitimately approved versions of liturgical texts (November, 1967). This decision authorizes the use of choral and other music in English when the older text is not precisely the same as the official version."
— Catholic Bishops for the dioceses of the United States (November, 1969)

“Agnus Dei” For Three Voices • Guillaume Dufay
published 19 September 2015 by Jeff Ostrowski

E HAVE BEEN ENCOURAGING choirmasters to use Solfège when training their choirs, but many readers are confused about why Solfège would help. The following piece demonstrates very well why Solfège is the best way to train amateurs in polyphony. During rehearsal, if your singers are missing a phrase, you can easily correct it when it’s done in Solfège. Isolating the incorrect pitches is much more difficult without Solfège:

For the record, my choir absolutely loves singing this Agnus Dei. It took us a while to learn, but has become one of our favorites now that it’s “clicked.”

    * *  PDF Download • “AGNUS DEI” by Guillaume Dufay (d. 1474)

EQUAL VOICES : YouTube   •   Mp3 Audio

HIGHEST VOICES : YouTube   •   Audio

MIDDLE VOICES : YouTube   •   Audio

BOTTOM VOICES : YouTube   •   Audio

The lowest voices must sing very, very softly when they ascend to the high notes—in falsetto if possible—otherwise the balance will be wrecked.