Writing for Two and Three Parts

Two-Part Writing

In two-part writing the primary intervals used are 3rds and 6ths, with some Perfect 8ves and 5ths.  For dissonances or Non-Chord Tones, use 4ths, 2nds, and 7ths.  Interplay between the voices and textural variation are important features.

Three-Part Writing

In three-part writing there is more flexibility.  A third part can join the first two to complete sonorities, or it may provide a pedal point or ostinato.

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