Questions: Smooth Voice Leading in Chord Progressions

Question 1

You are connecting a C major chord (C–E–G) to an A minor chord (A–C–E) in four voices. Which approach best applies smooth voice leading?

• A. Move all voices to the nearest available pitch in A minor, distributing the notes freely
• B. Retain C and E as common tones in their current voices; move only the voice holding G, which should step up to A
• C. Always move the soprano to the root of the new chord so the harmonic change is clearly announced
• D. Move each voice by the largest possible interval to give the chord change maximum impact

Answer: (B)

C major and A minor share two common tones: C and E. The principle of common tone retention says to hold these in the same voices across the chord change. The only voice that must move is the one holding G, and the nearest note in A minor is A — a half-step leap. Option A ignores which voices currently hold common tones and could produce unnecessary motion. Option C confuses harmonic function (soprano doesn't have to carry the root) with voice-leading economy.

Question 2

Why does smooth voice leading matter beyond following conventional rules?

• A. It ensures the bass moves more than the inner voices, clarifying the harmonic foundation
• B. It allows the ear to track each voice as an independent, continuous melodic line, making chord progressions feel inevitable rather than abrupt
• C. It guarantees that no voice crosses another, preventing harmonic ambiguity
• D. It produces the smallest total number of notes in a progression

Answer: (B)

The perceptual basis for smooth voice leading is voice tracking: the ear follows individual melodic lines through a chord texture. When voices move by small intervals, the listener can 'hear through' the harmony to each independent line. When voices leap randomly, the listener loses track of the individual strands, and the chord changes feel disjointed even if the harmonies themselves are correct. Bach's chorale writing is the standard model precisely because every voice is singable as an independent melody.

Question 3

In four-voice harmony, the bass is generally expected to leap more than the inner voices because its primary role is to define harmonic roots, which typically move by fourth or fifth.

• T. True
• F. False

Answer: True

The bass voice has a fundamentally different function from alto and tenor: it defines the harmonic root at each chord. Root-position progressions that move by fifth (V–I, IV–I) require bass leaps of a fourth or fifth, which are completely normal and expected. The inner voices (alto and tenor) fill harmonic space without melodic prominence, so their smooth stepwise motion is most important for maintaining voice continuity. The soprano sits in between — melodically prominent, but an expressive leap can work if resolved by stepwise motion.

Question 4

In smooth voice leading, any leap in any voice is considered an error and is expected to be revised.

• T. True
• F. False

Answer: False

Leaps are acceptable and sometimes necessary, especially in the bass. The goal is not to eliminate all leaps but to create an overall texture where each voice sounds like a singable melodic line. Even the soprano can leap expressively if the leap is resolved by stepwise motion in the opposite direction. What makes a leap problematic is an unresolved angular gesture or an unnecessary leap where stepwise motion was available — not leaping per se.

Question 5

What is the principle of common tone retention, and why does it contribute to smooth voice leading?

Model answer: Common tone retention means keeping a pitch that appears in both consecutive chords in the same voice across the chord change, rather than moving that voice to a different note. It contributes to smooth voice leading because the voice holding the common tone moves zero distance — the minimum possible motion. This creates a moment of stability at the chord change, anchoring the progression and giving the ear a reference point while other voices move.

Common tones are 'free' smooth voice leading: you get perfect stepwise economy (zero motion) with no effort. The more common tones two chords share, the easier smooth voice leading becomes. Progressions by third share two common tones and are thus naturally suited to lyrical, smooth textures; progressions by fifth share one; progressions by second share none, requiring all voices to move.