The unison may be used only at the beginning and end of an exercise. Thirds and sixths predominate in exercises, with fifths and octaves thoughtfully deployed for variety. Chains of more than three consecutive thirds or three consecutive sixths should be avoided. Avoid a cross relation against the leading tone in minor. Part-writing To promote independence of voices, contrary motion is preferred over similar motion or parallel motion, and similar motion is preferred over parallel motion.
Oblique motion is acceptable, but introduces a static element into the exercise.
No one type of motion should persist to the point of monotony. It is conducive to independence when the climax of the counterpoint does not coincide with that of the cantus. Simultaneous leaps in cantus and counterpoint should be avoided. In second species there are two notes to each note of the c.f. The counterpoint will of course be notated in half notes.