Source https://en.audiofanzine.com/music-theory/editorial/articles/parallel-voices.html

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The previous article allowed you to get to know chords better, discussing open and drop chords. This week we’ll take a look at a case where voices evolve in parallel, with a special focus on octaves and fifths. I know, I know: parallel octaves and fifths are forbidden, right? Indeed, when you want to stick to classic harmony, it is… .. Read more on Audiofanzine