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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“The plea that the laity as a body do not want liturgical change, whether in rite or in language, is, I submit, quite beside the point. … (it is) not a question of what people want; it is a question of what is good for them.”
— Dom Gregory A. Murray (14 March 1964)

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.