Questions: Doubling and Spacing in Four-Part Writing

Question 1

In a second-inversion triad (⁶₄ chord), which pitch should typically be doubled in four-part SATB writing?

• A. The root of the chord, as always
• B. The third of the chord, since it is in the soprano
• C. The fifth of the chord, which is also the bass note
• D. Any pitch may be doubled; second inversion has no preference

Answer: (C)

In second inversion, the fifth is in the bass. Because the second-inversion chord is harmonically unstable (the dissonant fourth above the bass), the convention is to double the bass note — the fifth — to anchor the chord. Doubling the root or third in second inversion would leave the chord without sufficient grounding and often leads to awkward voice-leading. This rule differs from root position (double the root) and first inversion (more flexibility, often double the soprano).

Question 2

A student is realizing a secondary dominant chord (V/IV) in SATB. Why should the raised scale degree — the chromatic note that makes it a secondary dominant — generally not be doubled?

• A. Chromatic notes have unstable frequencies that cause acoustic beating
• B. The chromatic pitch has a specific obligatory resolution direction; doubling it forces two voices into the same obligatory motion, which typically produces parallel octaves or awkward leaps
• C. Doubling any altered pitch is forbidden in all species counterpoint rules
• D. The chromatic note is always in the bass, so it cannot be doubled in upper voices

Answer: (B)

The chromatic pitch in a secondary dominant (e.g., a raised 4th scale degree) is a tendency tone that must resolve in a specific direction. If it is doubled, two voices are both obligated to resolve the same way — typically stepwise in the same direction — which almost inevitably produces parallel octaves. Avoiding the doubling leaves only one voice with that obligation, giving the other voices freedom to move in contrary motion and avoid parallels.

Question 3

In four-part SATB writing, the standard spacing rule requires no more than an octave between any two adjacent upper voices (soprano-alto and alto-tenor).

• T. True
• F. False

Answer: True

This rule reflects acoustic blend: when soprano, alto, and tenor are spread more than an octave apart from their neighbors, the texture becomes thin or disconnected. The rule applies between adjacent pairs in the upper voices. The tenor-bass interval is given more freedom because the low register projects differently and a wider gap (a tenth or eleventh) is common and acoustically natural. The rule does NOT apply equally to all voice pairs — only to the three upper voices' adjacent spacing.

Question 4

In a root-position major triad realized in four-part SATB writing, the fifth of the chord should be doubled because it provides the most harmonic stability.

• T. True
• F. False

Answer: False

The standard choice in a root-position triad is to double the root, not the fifth. Doubling the root reinforces the harmonic foundation of the chord. Doubling the fifth is possible but less common and can lead to awkward voice-leading, particularly when the fifth must resolve in a specific way. Doubling the leading tone (the third of a dominant chord) is actively avoided because it forces both voices to resolve upward to the tonic, nearly guaranteeing parallel octaves.

Question 5

Why is the chromatic pitch in chords like secondary dominants or augmented sixth chords typically avoided in doublings, and what happens when it is doubled?

Model answer: The chromatic pitch is a tendency tone with a specific obligatory resolution — for example, a raised note must typically resolve upward by half step. If it is doubled, two voices are both forced into the same directional resolution, and since they are resolving to the same pitch in the same direction, the result is almost inevitably parallel octaves between those two voices. By keeping the chromatic pitch in only one voice, the other voices retain freedom to move in contrary or oblique motion, allowing the chromatic resolution to occur without generating prohibited parallels.

This is why the 'don't double the chromatic pitch' rule is really a voice-leading efficiency rule in disguise. Understanding it as a consequence of tendency-tone logic — rather than a memorized prohibition — allows you to apply it correctly to any chord containing an altered pitch, even in styles or contexts where the exact rules differ from common-practice conventions.