Questions: Melodic Phrase Structure

Question 1

In a parallel period, what distinguishes the antecedent phrase from the consequent phrase?

• A. The antecedent is always longer than the consequent
• B. The antecedent ends with a weaker cadence; the consequent ends with a stronger, conclusive cadence
• C. The antecedent is in the major mode; the consequent is in the relative minor
• D. The antecedent contains the melodic climax while the consequent is purely cadential

Answer: (B)

In a parallel period, both phrases open with the same (or very similar) melodic material — that's what makes them 'parallel.' What distinguishes them is their endings: the antecedent closes with a weaker cadence (typically a half cadence on V) that leaves the music feeling unfinished, while the consequent closes with a stronger cadence (typically a perfect authentic cadence on I) that resolves the tension and completes the musical thought.

Question 2

A musical phrase is generally exactly four measures long.

• T. True
• F. False

Answer: False

Phrase length is determined by harmonic and melodic factors — cadential arrival, melodic contour, rhythmic momentum — not by a fixed bar count. While four-measure phrases are common in Classical-era tonal music, phrases can be 2, 3, 5, 6, 8, or more measures. They can also be extended, compressed, or elided. The defining feature of a phrase is its motion toward a cadence, not its duration.

Question 3

What is the functional difference between a half cadence and a perfect authentic cadence in the context of phrase structure?

Model answer: A half cadence ends on the dominant (V), creating harmonic tension and incompleteness — it calls for a continuation. A perfect authentic cadence closes with V→I motion with the tonic in the melody, producing full resolution and closure.

Cadences are the punctuation of tonal music. A half cadence functions like a comma — it pauses without finishing. A perfect authentic cadence functions like a period — it fully closes. In a period, the antecedent's half cadence poses a harmonic 'question' that the consequent's authentic cadence 'answers.' This tension-resolution dynamic depends on scale degree tendencies: the leading tone resolves up to the tonic, and the dominant harmony pulls toward resolution on I.