Suspension chords are a staple of traditional harmony, adding tension and release. But when writing four-part voice leading, many students wonder: can you use just one suspension chord in a progression without causing voice-leading errors? The answer is yes, but with careful attention to preparation, suspension, and resolution. This article explains how to incorporate a single suspension chord into four-part harmony while maintaining smooth voice leading.
Understanding Suspensions in Four-Part Writing
A suspension occurs when a note from a previous chord is held over into the next chord, creating a dissonance that then resolves downward by step. In four-part voice leading (SATB: soprano, alto, tenor, bass), suspensions are typically applied to one voice at a time, though you can have suspensions in multiple voices simultaneously—but that's more advanced. A single suspension chord means only one voice holds the suspended note while the other three move normally.
Common Types of Suspensions
The most common suspensions are 4-3, 7-6, and 9-8 (the numbers refer to intervals above the bass). In four-part writing, the suspension usually occurs in an upper voice (soprano, alto, or tenor), though the bass can also be suspended in rare cases. For a single suspension, you choose one voice to hold the dissonance.
Rules for a Single Suspension Chord
To use a single suspension correctly, follow these principles:
- Preparation: The suspended note must be a consonance in the previous chord. It is typically tied (or repeated) from that chord.
- Suspension: The note becomes a dissonance against the new chord (e.g., a 4th against the bass).
- Resolution: The suspended note resolves down by step to a consonance, usually on the same beat or just after the dissonance.
- Voice Leading: The other three voices move to their proper chord tones, avoiding parallel fifths/octaves with the resolving voice.
Example: 4-3 Suspension in Soprano
Consider a progression from I to V in C major: C (I) to G (V). If the soprano holds a C over from the I chord into the V chord, C becomes a 4th above the bass G (a dissonance). The soprano then resolves down to B (the 3rd of the G chord). Meanwhile, the alto and tenor move to their notes (e.g., G and D). The bass holds G. This single suspension works perfectly.
Practical Considerations for Four Parts
When you have only one suspension chord, the remaining three voices must complete the chord. Ensure that the bass note is the root of the chord (or another acceptable bass note like the third in first inversion). Also, avoid doubling the suspended note in another voice—if the suspended note is C, do not also place C in the alto or tenor, as that would weaken the dissonance or create parallel unisons.
Common Mistakes
- Illegal resolution: The suspended note resolves upward or by leap—wrong. It must resolve down by step (unless it's a retardation, which is rare).
- Parallel fifths/octaves: If the soprano resolves from C to B while the alto moves from G to G, that's fine, but ensure the alto doesn't move to F (creating parallel fifths with the bass).
- No preparation: The suspension must be prepared in the previous chord. You cannot introduce a new note as a suspension out of nowhere.
Why Use Only One Suspension?
In four-part writing, one suspension is often enough to create interest. Adding more suspensions can lead to complex voice leading and increased risk of errors. A single suspension draws attention to that voice and creates a clear sense of arrival when it resolves. It's a common technique in chorales and classical compositions.
Example Progression
Here's a simple progression in C major: I (C-E-G-C) to IV (F-A-C-F). Let's add a 4-3 suspension in the soprano. The soprano holds G from the I chord into the IV chord (G becomes a 4th above bass F). The soprano then resolves down to F (the 3rd of IV). The alto moves from C to A, tenor from E to F, bass from C to F. Check for parallels: soprano G->F, alto C->A (stepwise, fine), tenor E->F (stepwise), bass C->F (perfect fourth, fine). No parallels. This works.
Advanced: Multiple Suspensions
While you can have more than one suspension, it's not necessary for most exercises. If you do use multiple, each must follow the same rules. But since your question is about one suspension chord, focus on mastering that first.
Final Recommendation
Yes, you can absolutely have one suspension chord in four-part voice leading. The key is to follow the preparation-suspension-resolution pattern and watch for voice-leading errors. Practice by taking a simple chord progression and suspending a note in the soprano or alto. Check that the resolution is a step down and that the other voices move smoothly. With consistent practice, you'll find that a single suspension adds elegance to your writing without overwhelming the texture.
For students and composers, start with one suspension per phrase. As you gain confidence, experiment with different intervals (7-6, 9-8) and voices. Remember that the suspension is a tool for expressive tension—use it judiciously. A single well-placed suspension can be more effective than several cluttered ones.