Topmusicanswers
So-called hidden consecutives, also called direct or covered octaves or fifths, occur when two independent parts approach a single perfect fifth or octave by similar motion instead of oblique or contrary motion. A single fifth or octave approached this way is sometimes called an exposed fifth or exposed octave.
- Can you go from an octave to a fifth?
- Are unequal fifths allowed?
- Why are parallel octaves and fifths bad?
Can you go from an octave to a fifth?
188-189) As in two-part counterpoint it is illegal to approach a fifth or an octave in similar motion. You will be happy to know that this rule is considerably weakened in a 4-voice texture. It only applies between the outer voices, soprano and bass.
Are unequal fifths allowed?
The reverse, a rising P5→d5, is acceptable voice leading (no deduction). Unequal fifths in either order, when descending, are acceptable (no deduction).
Why are parallel octaves and 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.
