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3. Corresponding or adjacent registers should be made to coincide except for certain colour effects:
| To be avoided: | The second flute will sound too weak and the oboes too piercing. | |
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4. Concords (octaves, thirds and sixths) and not discords (fifths, fourths, seconds and sevenths), should be given to instruments of the same kind or colour, except when discords are to be emphasised. This rule should be specially observed in writing for the oboe with its penetrating quality of tone:
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Four-part and three-part harmony.
Harmonic writing for the wood-wind may be considered from two points of view: a) instruments in pairs, 2 Fl., 2 Ob., 2 Cl., 2 Fag.; and b) instruments in three's, 3 Fl., 2 Ob., Eng. horn, 3 Cl., 2 Fag., C-fag.
A. In pairs. There are three ways of distribution: 1. Superposition or overlaying (strictly following the normal order of register), 2. Crossing, and 3. Enclosure of parts. The last two methods involve a certain disturbance of the natural order of register:
Overlaying. Crossing. Enclosure.
