Enclosure:

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B. Wood-wind in three's. Here the distribution of chords in close three-part harmony is self-evident; any grouping of three instruments of the same timbre is sure to sound well:

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also:
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Overlaying of parts is the best method to follow in writing close four-part harmony; three instruments of the same timbre with a fourth instrument of another. Crossing and enclosure of parts may also be employed. Correspondence of timbres and the progression of remote parts must be kept in mind: