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 sun’s disc did not remain immobile. This was not the sparkling of a heavenly body, for it spun round on itself in a mad whirl, when suddenly a clamor was heard from all the people. The sun, whirling, seemed to loosen itself from the firmament and advance threateningly upon the earth as if to crush us with its huge fiery weight. The sensation during those moments was terrible.”
— Dr. Almeida Garrett, professor of natural sciences at the University of Coimbra (1917)

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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.