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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Some are called not to much speaking, | nor to conversations about the Church, | but, rather, to a deep silence | and to a life hidden in the heart of the Church, | far from wrangling tongues, from speculations, and discord. [ … ] This is the essence of a Eucharistic monastic life.
— Fr. Mark Daniel Kirby (Meditation on Colossians 3:3)

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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.