Four-part Harmony Issues Summary & Study Notes

🎼 Concept recap

In four-part harmony, sound quality hinges on clean voice-leading, proper spacing, careful doubling, and correct handling of suspensions and sevenths. The prompt asks which issue is present between spacing, doubling, suspension preparation, or seventh resolution, so understanding each concept helps you diagnose a score quickly.

🎯 Spacing and voice-leading

Spacing refers to the distance between adjacent voices. Common mistakes include spacing that exceeds an octave between neighboring voices, or awkward leaps that break smooth line motion. Keep inner voices within comfortable ranges and aim for smooth stepwise motion where possible.

🔗 Doubling rules in chords

Doubling is choosing which chord tone to place in the doubled voice. In root-position triads, double the root to stabilize the harmony. In first inversion, avoid doubling the leading tone and try to double a note that keeps voices evenly balanced. For seventh chords, double the root when possible and be cautious about doubling the third or seventh, which can create voice-leading hazards. In minor keys, be mindful of altered leading tones when deciding doublings.

🪝 Suspension basics

A suspension involves a note that is prepared as a consonance in the preceding chord, held over to create a dissonance against the next chord, then resolves by step to a consonance. The most common type is the $4-3$ suspension, where the interval of a perfect fourth above the bass becomes a third above the bass on the resolution. Proper preparation means the suspended note is present in the prior chord as a consonance; the dissonance appears on the next chord, and then it resolves by step downward.

🎚 Preparing suspensions correctly

• The suspended note must exist as a consonance in the preparation chord (usually a common tone or a held tone).
• The dissonance must occur on the target chord, not in the preparation chord.
• Resolution should move by step in the same voice to a consonant tone.

Common suspension types include $4-3$, $7-6$, and $9-8$ suspensions. Mispreparation or improper resolution creates a noticeable voice-leading error and can disrupt the entire progression.

🧭 Resolution of the chordal seventh

When a chord contains a seventh (for example, a $V_7$ chord), the seventh must resolve downward by step to the third of the next harmony. For instance, in the key of C major, a $V_7$ chord ($G7 = G- B- D- F$) typically resolves to $I$ (C major), with the seventh F moving down to E. Failing to resolve the seventh by step weakens the sense of cadence and causes poor voice-leading.

🔎 Quick diagnostic checklist

• Are there any parallel fifths or parallel octaves between adjacent voices? If so, revise spacing or doublings to avoid them.
• Is the spacing between adjacent voices within an octave? If not, adjust voicing or redistribute notes.
• Are the chord doublings appropriate for the chord type (triad vs seventh chord) and inversion?
• Is every suspension properly prepared, dissonant only on the target chord, and resolved by step?
• Does every $V_7$ resolve its seventh downward by step to the following chord's chord-tone?

🧩 Summary tips

• Start with a solid bass line and ensure the outer voices maintain good spacing and smooth motion. Bold voice-leading decisions keep the middle voices coherent.
• When in doubt about doubling, default to doubling the root for triads and root in seventh chords, then adjust based on voice-leading needs.
• Treat suspensions like a small ruleset: preparation (consonance), dissonance (suspension), resolution (stepwise downward).

📚 Practical exercise ideas

• Take a two-staff chorale-like line and test each potential mistake: try adding a tendency tone that leads to illegal parallels, then rewrite to avoid them.
• Practice identifying the type of suspension by analyzing the bass and the suspended voice across chords.
• Create a short progression in a key of your choice and verify that all sevenths resolve properly and doublings follow the guidelines above.