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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“The main place should be given, all things being equal, to gregorian chant, as being proper to the roman Liturgy. Other kinds of sacred music, in particular polyphony, are in no way excluded, provided that they correspond to the spirit of the liturgical action and that they foster the participation of all the faithful.”
— 2011 GIRM, §41 (Roman Missal, 3rd Edition)

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Shocking Parallels By Guerrero
published 22 April 2016 by Jeff Ostrowski

Play the Soprano & Alto lines on a piano:

541 parallel 4ths Guerrero


Can you understand why I find this shocking?

Why—you might ask—is he allowed to get away with this? The fact is, the more voices one adds, the more freedom is granted to the composer. Moreover, in this passage, Guerrero has an amazing canon happening between Soprano & Quintus; so we should cut him some slack.

I’ve seen similar passages by Orlando Lassus—where he technically does not break rules, but the overall effect contains massive parallels.