In species counterpoint, the cadence must end with

Question

BlackTom AI · Accepted Answer

In modal species counterpoint the melodic approach to the final must be by step from the leading tone (^7) to the tonic (^8), so the cadence properly ends with ^7–^8.

1) Relevant knowledge points and concepts
- A cadence in species counterpoint must produce a final perfect consonance (unison or octave) and should be approached by step in at least the melodic line that concludes the phrase.  
- Commonly taught cadential formula in species (Fux-style) uses a penultimate consonance (a 6th in two-voice writing) resolving to the final octave, which is achieved when a voice moves from scale degree 7 to 8 (leading tone to tonic).  
- Leaps into the final or retention of the same scale degree are discouraged because they violate the rule that the final melodic motion should be conjunct (stepwise) and create clear tonal resolution.

2) Step-by-step reasoning
- The final vertical sonority must be a perfect consonance (octave/unison).  
- To create a strong cadence, the penultimate vertical sonority is typically a consonant interval (a sixth) that resolves to the octave by stepwise motion.  
- If one voice is on ^7 and moves up by step to ^8, the vertical interval commonly moves from a sixth to an octave (a conventional cadential pattern). This supplies the necessary leading-tone resolution and stepwise approach.

3) Intermediate “calculation” / intervalal steps (illustrative)
- Suppose cantus firmus ends on C (8). If the counterpoint voice is on B (7), the interval before the final is a sixth (B to G? depending on voices—conceptually a consonant penultimate). Moving B → C (7 → 8) yields the final octave/unison with stepwise motion.

4) Why the correct answer (^7–^8) is correct
- It provides the required stepwise approach from the leading tone to the tonic, produces the conventional penultimate consonance resolving to a perfect final, and fulfills species counterpoint rules about melodic motion into the final.

5) Why the other options are incorrect
- ^8–^8: repeating the final pitch (harmonic and melodic stationary) lacks the stepwise approach and weakens cadential motion.  
- ^4–^8: is usually a leap of a 4th (or larger) into the final—nonconjunct and not the standard cadential approach.  
- ^6–^8: is a leap of a third into the final (not the conventional leading-tone resolution), and does not create the standard 6→8 penultimate-to-final relationship required for a strong cadence.

Conclusion: The cadence must end with ^7–^8, which matches the provided correct answer.

In species counterpoint, the cadence must end with 单项选择题

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