Dissonant intervals are forbidden in which of the following species?

Question

BlackTom AI · Accepted Answer

First-species counterpoint permits only consonant sonorities, so dissonant intervals are forbidden in the first species.

Relevant concepts: Species counterpoint (as codified by Fux) is taught in five species. First species is note-against-note (one note in the counterpoint against one note in the cantus firmus). The basic rule for first species is that every vertical sonority must be consonant. Consonances are the unison, octave, perfect fifth (perfect consonances) and the major/minor third and sixth (imperfect consonances). Dissonances (seconds, sevenths, diminished/augmented intervals, and tritones) are not allowed as vertical sonorities in first species.

Step-by-step reasoning:
1. Identify the species: the choices are species numbers (first, second, fourth, fifth); we ask which species forbids dissonance entirely.
2. Recall rules for first species: every simultaneous interval must be consonant; no passing or accented dissonances may occur.
3. Recall rules for other species:
   - Second species (two notes against one): allows dissonances on the weak (off) beats as passing or neighbor tones, provided they are resolved properly.
   - Fourth species (suspensions): intentionally creates dissonances on strong beats as suspensions that are prepared and resolved; thus dissonance is allowed in controlled form.
   - Fifth species (florid): combines previous species and allows dissonances as passing, neighbor, and suspended tones in proper context.
4. Therefore, only first species strictly forbids dissonant intervals.

Why the correct answer is correct: First species’ defining restriction is exclusively consonant sonorities at every point, which directly forbids dissonant intervals. Why the other options are incorrect: second, fourth, and fifth species each permit dissonance in certain controlled contexts (passing tones, suspensions, or florid mixtures), so they do not categorically forbid dissonant intervals.

Conclusion: Dissonant intervals are forbidden in the first species—this matches the provided correct answer (first).

Dissonant intervals are forbidden in which of the following species? 单项选择题

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