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 resides with his wife and children.
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“As the subject of the language of worship was discussed in the Council hall over the course of several days, I followed the process with great attention, as well as later the various wordings of the Liturgy Constitution until the final vote. I still remember very well how after several radical proposals a Sicilian bishop rose and implored the fathers to allow caution and reason to reign on this point, because otherwise there would be the danger that the entire Mass might be held in the language of the people-whereupon the entire hall burst into uproarious laughter.”
— Alfons Cardinal Stickler, peritus of Vatican II

Rehearsal Videos • A Resplendent “Agnus Dei” You've Never Heard
published 23 February 2016 by Jeff Ostrowski

URING the 1950s, Pope Pius XII added a special feast in honor of the Queenship of the Blessed Virgin Mary. 1 The antiphon for the Magnificat—“Beata Mater”—was not invented during the 1950s. It’s a very ancient chant, and Francisco Guerrero wrote an entire Mass based upon it. Throughout the various movements, Guerrero uses the CANTUS FIRMUS in clever ways, demonstrating his mastery of the “architecture” of large musical forms. 2 For example, the entire CREDO is a Canon between Soprano & Alto.

Can you hear what Guerrero does with the CANTUS FIRMUS (“Beata Mater”) in the final movement of this Mass? Do you see how he creates a perfect Canon between Soprano & Tenor?

    * *  PDF Download • AGNUS DEI • Guerrero “Missa Beata Mater”


EQUAL VOICES : YouTube   •   Mp3 Audio

SOPRANO : YouTube   •   Audio

ALTO I : YouTube   •   Audio

ALTO II : YouTube   •   Audio

TENOR : YouTube   •   Audio

BASS : YouTube   •   Audio


1   He did so by means of a special document, explaining why this feast was added.

2   Guerrero’s teacher, Cristóbal de Morales, was also brilliant when it came to such things.