Introduction to Counterpoint
Lesson 11 January 28th, 2021 Lesson 11 Lecture notes: There are four types of contrapuntal motion: (C) Contrary motion , (P) Parallel motion , (S) Similar motion, and (O) Oblique motion . Contrary motion is when two parts move in opposite directions giving voices the most independence and balance . Parallel motion is when both parts move in the same direction using the same interval . This is only allowed between imperfect consonances and not perfect consonances . Similar motion is when both parts move in the same direction but using different intervals . This motion can be used freely except when approaching a perfect interval , which is only acceptable if the upper parts move by a step . Oblique motion is when one part repeats or sustains a single pitch , and the other moves by either a leap , skip or step . This motion is acceptable ; however, it is not desirable because one part is required to be static . Perfect consonant intervals consist of PU (