Questions: Conjunct Motion and Smooth Voice-Leading

Question 1

A composer is writing four-part harmony and moving from a C major chord (C-E-G) to an F major chord (F-A-C). Which approach best exemplifies smooth voice-leading?

• A. Move every voice down by a third to create maximum harmonic contrast between the two chords
• B. Keep the common tone C stationary, move E up by step to F, and move G up by step to A, minimizing total melodic motion
• C. Move the soprano by a sixth leap to prominently outline the new chord's root
• D. Ignore the inner voices and focus exclusively on creating smooth bass motion

Answer: (B)

Smooth voice-leading means using the smallest interval necessary to connect the two chords. C appears in both chords (common tone) and should stay put — zero motion is the extreme of parsimony. The remaining voices can reach F and A by moving up a step each. This minimizes total melodic distance while producing a complete F major chord. Large leaps in option A create motion for its own sake rather than serving harmonic function.

Question 2

A student writes an inner voice line that leaps down a sixth, then up a seventh, then down a fifth. What is the primary problem with this line?

• A. These intervals create parallel octaves with the soprano line
• B. The intervals are theoretically incorrect — inner voices may only use thirds and fourths
• C. The excessive leaps make the line unsing-able and create the feeling of a voice in constant recovery rather than a coherent, flowing line
• D. Inner voices should remain stationary rather than moving independently

Answer: (C)

The practical test for smooth voice-leading is whether a singer could perform the line comfortably. Leaps are not forbidden, but large leaps require physical preparation and recovery — the voice is continually thrown to new pitch locations. A line alternating large leaps in opposite directions has no sense of melodic flow. The standard for inner voices is the same as for the melody: singable, coherent, purposeful.

Question 3

Common tones — notes that appear in both the current chord and the next — should generally remain stationary in smooth voice-leading.

• T. True
• F. False

Answer: True

Keeping a common tone stationary is the extreme case of voice-leading parsimony: zero motion. There is no reason to leap away from a note and return to it when you could simply hold it. Stationary common tones anchor the texture and free other voices to move by step to their new pitches, minimizing total melodic distance across all voices.

Question 4

Smooth voice-leading is primarily a concern for the soprano and bass lines; inner voices can move more freely because listeners pay less attention to them.

• T. True
• F. False

Answer: False

Smooth voice-leading applies to all voices. Inner voices are less prominent melodically, but they contribute to the overall texture's comfort or awkwardness — listeners subconsciously feel rough inner voice motion even without explicitly tracking it. Bach's chorales, the paradigm of voice-leading craft, achieve smooth, singable motion in all four parts simultaneously. Rough inner voices reveal that harmonic logic, not melodic craft, drove the note choices.

Question 5

What is voice-leading parsimony, and why does it produce better musical results than letting harmonic function alone determine note choices?

Model answer: Voice-leading parsimony means moving from chord to chord using the smallest possible interval in each voice — minimizing total melodic distance traveled across all parts simultaneously. When harmonic logic alone drives note choices, voices may leap unnecessarily to complete the chord, disrupting the sense of continuous melodic flow. Parsimonious voice-leading satisfies both constraints at once: every chord is harmonically complete, and every voice moves as efficiently as possible, producing lines that are singable, coherent, and perceptually distinct — the hallmark of polyphonic texture that feels fluid rather than lurching.

The principle traces to the physics and psychology of voice: listeners track each voice as a continuous stream, and stepwise motion maintains that stream more naturally than leaps. Smooth voice-leading is what happens when the composer cares as much about the line as about the harmony.