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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“I grew up listening to Lessons & Carols from Cambridge and that was Advent-Christmas for me. Then I moved to Rome and discovered Rorate Masses, the Novena of the Immaculate Conception with the Tota Pulchra, the Christmas Novena, the O Antiphons, the Aspiciens, the Rorate Coeli, the Alma Redemptoris Mater: that's Advent for me now. I am glad to see seminarians all over the United States doing Lessons & Carols, but are they learning our ancient Roman traditions alongside a 20th-century Anglican one?”
— Rev. Christopher Smith

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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.