1. The voice leading
In harmonization with 2 or more parts, each voice must meet a certain
melodic logic,
through various agreements.
This logic is based on the following principles:
a. Vertical consideration
• In harmony with 4 voices for example, the range of each part is modeled on the
human voice:
• The vertical space between the voices is also limited :
Soprano / Alto |
1 octave maximum |
|
Alto / Tenor |
1 octave maximum |
|
Tenor / Bass |
1 twelfth maximum |
Note : These limits can be broken briefly.
• The doublings
The triads require note doublings from 4 harmonic voices
These doublings are determined in relation to the series of overtones.
We must double in order :
- The root
- The fifth
- The third
Note : With the diminishd triads, we must duplicate the third.
• The deletions:.
In a perfect major or minor triad, we must first delete the fifth.