Are Parallel Fourths Okay?
Parallel Fourths (Consecutive Perfect Fourths) Are Allowed, Even Though a P4 Is the Inversion and Thus the Complement of a P5. .. . However Parallel Fourths in...
Parallel fourths (consecutive perfect fourths) are allowed, even though a P4 is the inversion and thus the complement of a P5. ... However parallel fourths in upper voices (especially as part of a parallel "6-3" sonority) are common, and formed the basis of fifteenth-century fauxbourdon style.
Why are parallel fourths bad?
Re: Parallel 4ths
Successive parallel intervals do not suggest counterpoint, and can lead to some awkward parts when writing in a style based off of circle of fifths progressions, which is why they were avoided in polyphonic music.
Are parallel fifths bad?
In this style, known as the Common Practice Period, parallel fifths and octaves tend to leave a blank space, or a gap, in the musical texture (the overall sound) as if a voice has disappeared. This is why, in this context, parallel fifths are bad.
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