Note A — SIMPLE COUNTERPOINT IN THREE PARTS

In severely strict counterpoint all parts above the lowest must be consonant with it. Dissonances, when entering simultaneously with it, must be treated as suspensions, and when used in the progression of a part from one chord to another, should be treated as passing-tones or embellishments. This excludes the use of the unprepared seventh and ninth; all diminished and augmented triads except in their first inversion; and all six-four chords, except when the lowest part is treated as a passing-tone.