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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“One would be straying from the straight path were he to wish the altar restored to its primitive table form; were he to want black excluded as a color for the liturgical vestments; were he to forbid the use of sacred images and statues in Churches; were he to order the crucifix so designed that the divine Redeemer's body shows no trace of His cruel sufferings; and lastly were he to disdain and reject polyphonic music or singing in parts, even where it conforms to regulations issued by the Holy See.”
— Ven. Pope Pius XII (20 November 1947)

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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.