In species counterpoint, perfect consonances must be approached by

Question

BlackTom AI · Accepted Answer

Perfect consonances must be approached by contrary or oblique motion.

1. Relevant knowledge points and concepts
- Perfect consonances in species counterpoint are unisons, perfect fifths, and perfect octaves. 
- Types of melodic motion between two voices: parallel (same interval maintained while both move in same direction by same interval), similar (both move in same direction but by different intervals), contrary (move in opposite directions), and oblique (one voice stays, the other moves). 
- Counterpoint rules forbid parallel perfect fifths and octaves and discourage direct (hidden) fifths/octaves—these occur when voices move in similar motion into a perfect consonance, especially when the upper voice leaps.

2. Step‑by‑step reasoning
- The pedagogical goal is to preserve the independence of voices and avoid successive perfect intervals. If a perfect consonance is reached by similar or parallel motion, the ears perceive a collapse of independence (parallel fifths/octaves) or a “direct”/hidden perfect if the motion is similar and the upper voice leaps. 
- Approaching by contrary motion ensures voices move away from or toward each other so that the perfect interval is not a continuation of an identical intervallic relationship. Oblique motion keeps one voice stationary, preventing consecutive motion into a perfect with both voices moving in the same direction.

3. Intermediate examples (illustrative)
- If the bass moves C→D while the soprano moves G→A (similar motion), arriving at D–A (a perfect fifth) can create a hidden/parallel fifth if previous interval was a consonance moving similarly. 
- If bass C→B and soprano G→F# (contrary motion), arriving at B–F# (perfect fifth) avoids hidden parallels.

4. Why the correct answer is correct
- Contrary or oblique motion prevents the exact problematic configurations (parallel/direct perfects) targeted by the counterpoint rules, so these are the permitted approaches to perfect consonances.

5. Why other options are incorrect
- "Contrary motion only" and "oblique motion only" are too restrictive: both are acceptable, not just one. 
- "Parallel or similar motion" is incorrect because these motions produce parallel or direct (hidden) perfect fifths/octaves, which are prohibited.

6. Conclusion
- Therefore the correct choice is "contrary or oblique motion.", which matches the provided answer.

In species counterpoint, perfect consonances must be approached by 单项选择题

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