A composer writes a four-voice polyphonic passage. The soprano and bass have active, shapely melodic lines, but the alto voice holds long chord tones and mostly stays still. What is the fundamental problem with this texture?
AThe alto is too high in register and will clash with the soprano
BThe alto voice is functioning as harmonic filler rather than an independent melodic line, which undermines polyphonic texture
CThe alto should move in parallel with the soprano to strengthen the harmony
DThere is no problem — inner voices in polyphony are designed to sustain chord tones
In polyphonic writing, every voice must function as an independent melody with its own shape, momentum, and forward direction. An alto that merely sustains chord tones has become a harmonic prop, not a melodic participant — it could be removed without losing a distinct voice. The defining discipline of polyphony is treating each line as a participant: it should climb toward peaks, find moments of repose, and use stepwise motion and small leaps to maintain interest. Bach's inner voices are as compelling as his outer ones precisely because he refused to treat them as fillers.
Question 2 Multiple Choice
Why are parallel octaves problematic in polyphonic voice leading?
AThey create dissonance that is difficult to resolve
BThey require both voices to use the same rhythmic values
CTwo voices moving in parallel octaves fuse into a single doubled line, destroying the independence that polyphony requires
DThey violate harmonic rules about chord voicing
Parallel octaves (and parallel perfect fifths) are prohibited in strict polyphony because they cause two voices to lose their independence and merge perceptually into one voice with a particular timbral color. The octave creates the strongest possible acoustic fusion between two pitches — they share all their overtones. When two voices move in parallel octaves, the listener hears one line, not two. The rule against parallel perfect intervals is ultimately a rule about textural integrity: the goal is to maintain distinct, followable melodic strands.
Question 3 True / False
In polyphonic writing, contrary motion between voices is preferred because it maximizes the perceptual independence of the melodic lines.
TTrue
FFalse
Answer: True
Contrary motion — one voice rising while another falls — is the strongest way to differentiate two melodic lines. If both voices move in the same direction (parallel motion), they begin to sound related or even merged. Contrary motion creates maximum differentiation and gives each voice a distinct trajectory in the listener's ear. This is why counterpoint pedagogy emphasizes it: independent lines that move in opposite directions are easier to follow as separate strands of musical thought.
Question 4 True / False
In polyphonic writing, the composer should choose the harmonic progression first, then compose the melodic lines to fit the chords.
TTrue
FFalse
Answer: False
This describes homophonic thinking, not polyphonic thinking. In homophony, harmony leads and voices fill in. In polyphony, the relationship is reversed: you write independent melodic lines, and the harmony emerges as the outcome of their combination. The chord is not the starting point — it is what results when multiple well-crafted melodies happen to sound simultaneously. Starting from chords in polyphonic writing leads to voices that serve the harmony rather than functioning as independent lines, which is the defining problem that polyphonic voice leading aims to solve.
Question 5 Short Answer
What is the key conceptual difference between polyphonic and homophonic texture, and how does it change what the composer focuses on?
Think about your answer, then reveal below.
Model answer: In homophonic texture, harmony is the primary concern — the composer selects chords first and assigns voices to support them. In polyphonic texture, independent melody is the primary concern — the composer writes multiple self-sufficient melodic lines, and the harmony is an outcome of their combination. This reversal of priority means that in polyphony, the composer's attention is on each voice's melodic shape, momentum, and independence rather than on which chord is sounding at any given moment.
This distinction matters practically because it changes every compositional decision. A homophonic composer asks 'which chord fits here?' A polyphonic composer asks 'where does this melody want to go next?' The great polyphonic composers — especially Bach — thought in terms of voice trajectories. When an inner voice feels flat, the fix is not to adjust the harmony but to make the line more melodically interesting as a standalone melody.