Questions: Cadential Design and Structural Closure

Question 1

Two phrases both end with an authentic cadence (V–I). One feels like a major structural arrival; the other feels provisional. What could account for this difference?

• A. The first cadence uses a different key, making it more surprising and memorable
• B. The structural cadence arrives at a metrically strong position with stronger harmonic preparation and textural reinforcement — factors the cadence type alone cannot provide
• C. Authentic cadences only create structural closure when they appear at the beginning of a section
• D. The provisional phrase must have used a deceptive cadence, not a true authentic cadence

Answer: (B)

Cadence type is necessary but not sufficient for structural closure. An authentic cadence at a metrically weak position, approached with minimal harmonic preparation and thin texture, will feel like a local event — a phrase boundary rather than a formal pillar. Structural cadences earn their weight through reinforcement: metrically strong placement, harmonic momentum (often a predominant or cadential six-four), and all voices arriving together. Two identical cadence types can have very different structural weight based on context.

Question 2

A composer wants to create the strongest possible sense of closure at the end of a section. Which approach to the cadential dominant would be most effective?

• A. Move directly from IV to V to I, keeping the progression straightforward
• B. Precede the dominant with the cadential six-four (I⁶₄), which intensifies the need for resolution through dissonance
• C. Use a deceptive cadence (V–vi) followed immediately by V–I, creating a two-stage arrival
• D. Sustain the tonic as long as possible before the dominant to build anticipation

Answer: (B)

The cadential six-four (I⁶₄ before V) is one of the most powerful preparations in tonal music because the fourth and sixth above the bass are dissonances that demand resolution to the dominant triad. This intensifies the listener's need for resolution, making the eventual V–I feel earned and inevitable. Simple IV–V–I prepares the dominant but lacks this dissonant intensification.

Question 3

A half cadence (ending on V) creates a sense of finality that closes a musical phrase.

• T. True
• F. False

Answer: False

False. A half cadence ends on the dominant (V), which is inherently unstable in tonal harmony — it generates tension and expectation rather than releasing it. A half cadence is the musical equivalent of a question mark or comma: it marks a boundary but demands continuation. Finality requires an authentic cadence (V–I), which resolves dominant tension by arriving on the tonic.

Question 4

Two phrases can end with identical cadence types yet have different degrees of structural closure depending on factors like metric placement and harmonic preparation.

• T. True
• F. False

Answer: True

True. Structural closure is not determined by cadence type alone — it requires that the cadence be treated as a formal pillar by the surrounding musical context. A phrase may end with an authentic cadence and still feel subordinate if it arrives at a metrically weak position with thin texture and minimal harmonic momentum. Composers control this hierarchy deliberately to shape listener expectations about formal boundaries.

Question 5

What is the difference between phrase closure and structural closure in tonal music?

Model answer: Phrase closure is the local sense of completion at the end of an individual phrase, typically marked by a cadence. Structural closure refers to cadential weight at the level of formal sections — the strongest cadences in the piece, which serve as formal pillars. A phrase may achieve phrase closure with an authentic cadence but still function as a subordinate local event if it lacks the metric weight, harmonic preparation, and textural reinforcement that mark structural cadences.

The distinction matters for compositional control: understanding that cadence type is not the only determinant of closure allows a composer to use authentic cadences freely within a section while reserving full structural weight for the most important formal boundaries. The listener's sense of form is shaped not merely by which cadences occur, but by which cadences the surrounding context treats as structurally significant.