Understanding Suspensions in Four-Part Voice Leading

Suspensions are one of the most expressive tools in four-part voice leading. They create momentary dissonance that resolves smoothly, adding tension and release to harmonic progressions. In traditional SATB (soprano, alto, tenor, bass) writing, suspensions follow specific rules regarding preparation, suspension, and resolution. This article breaks down the mechanics, types, and best practices for using suspensions effectively in your four-part compositions.

What Is a Suspension?

A suspension is a non-chord tone that is held over from a previous chord (preparation) into the next chord, where it becomes dissonant against the new harmony. The suspension then resolves downward by step (usually a whole or half step) to a chord tone. In four-part voice leading, suspensions typically occur in the upper voices (soprano, alto, tenor) against the bass, which moves to the next chord.

The Three Stages of a Suspension

1. Preparation: The suspended note appears as a consonance in the previous chord, usually as a chord tone. It must be tied or repeated into the next chord.
2. Suspension: The note is held over to the next chord, creating a dissonance (usually a 4th, 7th, or 9th above the bass).
3. Resolution: The suspended note steps down by a half or whole step to a chord tone in the new harmony. The resolution note is usually a third or fifth above the bass, but can be other stable tones.

Types of Suspensions

Suspensions are classified by the interval between the suspended note and the bass of the new chord. Common types include:

4-3 Suspension

• The most common. The suspended note forms a 4th above the bass, then resolves down to a 3rd. Example: In C major, a held G over an F bass (F major chord) creates a 4th (G-F), then resolves to E (3rd).

7-6 Suspension

• The suspended note is a 7th above the bass, stepping down to a 6th. Often used in inversions.

9-8 Suspension

• Less common in strict four-part writing, but appears in later styles. The suspended note is a 9th above the bass, resolving down to an octave.

2-3 Suspension

• The suspended note is a 2nd above the bass (often the same as a 7-6 in upper voices), resolving to a 3rd.

Writing Suspensions in SATB

When incorporating suspensions into four-part voice leading, respect these guidelines:

Choosing the Voice

• Suspensions usually occur in soprano, alto, or tenor. The bass rarely suspends because it would disrupt the harmonic foundation.
• The soprano (melody) is the most exposed, so suspensions there are very noticeable.
• Inner voices (alto, tenor) can also suspend but should be handled carefully to maintain clarity.

Preparation Rules

• The prepared note must be a chord tone in the previous chord. It should appear in the same voice.
• The preparation note is often the root, third, or fifth, but must be consonant with the previous harmony.
• Avoid preparing a suspension with a dissonance (like a passing tone or another suspension).

Suspension and Resolution

• The suspended note must be held (not repeated) over the barline or chord change. It can be tied or simply held if the voice stays on the same pitch.
• The resolution must occur on a metrically strong beat (usually the next beat after the suspension).
• The resolution step is downward by a half or whole step. Do not resolve upward.
• The resolution note must be a consonant chord tone (usually a third, fifth, or octave above the bass).

Voice Leading Considerations

• Avoid parallel fifths and octaves. A suspension can easily create parallels, so check intervals between voices.
• In a 4-3 suspension, the bass often moves to a note that produces a 4th with the suspended voice, then the bass may move again during resolution. Plan contrarily.
• The suspended voice should not cross voices. Keep each voice in its normal range.
• The resolution note may be doubled in another voice, but be cautious not to create hidden parallels.

Common Suspension Progressions

Authentic Cadence with Suspension

• A classic V-I cadence with a 4-3 suspension in the soprano: . In C major, the V chord (G major) has the soprano on D (5th). The I chord (C major) begins with the soprano holding D over C bass (4th), then resolving to C (3rd). The alto and tenor fill the rest of the chord.

Plagal Cadence with Suspension

• IV-I with a suspension: In F major, IV (Bb major) to I (F major). Soprano holds a note (say Bb) over F bass (4th) resolving to A (3rd).

Passing Suspension

• Used in non-cadential contexts. For example, a I-IV progression where a note is suspended to create passing dissonance.

Common Mistakes to Avoid

• Double suspension: Two voices suspending simultaneously can be hard to resolve without parallels. Use with care.
• Incomplete resolution: The suspension must resolve; don't leave it hanging or move to a different voice.
• Missing preparation: The note must be heard as a consonance before suspension. Skipping prep breaks the rule.
• Voice leading gaps: Ensure the suspended voice moves stepwise down; large leaps after suspension are not allowed.

Practical Application: Writing a Four-Part Exercise

Let's walk through a short example in G major.

Exercise: Write a I - V - I progression with a 4-3 suspension in the soprano on the final I.

• Chord 1 (I): G - B - D - G (from bottom: G bass, D tenor, B alto, G soprano).
• Chord 2 (V): D - F# - A - C (D bass, A tenor, F# alto, C soprano — note: the soprano C is a fourth above G? Wait, need to adjust for suspension. Actually, we want the suspension on the I chord. So let's design: V chord: D bass, A tenor, F# alto, D soprano. But the suspension note must be prepared in the V chord as a consonance. The suspended note will resolve to the third of I (B). So in V, the soprano should have the pitch that will be suspended (say A, which is the fifth of V). Then at the I chord, the soprano holds A over G bass (forming a 4th), then resolves to B (a third above G).
• So V: D bass, A tenor, F# alto, A soprano. The soprano A is a chord tone (5th), so it's prepared.
• I: G bass, D tenor (5th), B alto (3rd), soprano holds A (4th) then moves to B (3rd).

Check voice leading: soprano A to B (step up? No, resolution must be down. A to G is down a step — that would be a 4-3 suspension? Actually, A to G is a 4th to 3rd above G bass? A above G is a 2nd (major 2nd), not a 4th. Wait: interval from bass G to soprano A is a 9th (or 2nd) — that's a 9-8 suspension. For a 4-3, the suspended note should be a 4th above the bass. In G major, the fourth above G is C. So the suspended note should be C on the I chord. Then resolve C down to B (half step) — that's a 4-3. So prep: on V chord, soprano has C (which is the seventh of V — but that's dissonant! Need to make sure C is a chord tone in V? V of G major is D major (D F# A). C is not a chord tone. So C cannot be prepared. So we need a different suspension. Use the 7-6: soprano holds F# over G bass (7th) then resolves to E (6th). But F# is in the V chord? V is D F# A — yes, F# is the third. That works. So:

• V: D bass, A tenor, D alto? Wait, need to fill. V: D (bass), A (tenor, 5th), F# (alto, 3rd), and soprano F# (doubling 3rd). Then I: G bass, D tenor (5th), B alto (3rd), soprano holds F# (7th above G) then resolves to E (6th). But E is not a chord tone in I (G B D). E is the 6th — not a chord tone! That's a 7-6 suspension over the bass, but the resolution to 6th is a non-chord tone unless the chord is I^6 (first inversion). In root position I, the sixth above bass (E) is not a chord tone. So the resolution must be to a chord tone. In G major, the chord tones are G B D. So the suspended note should resolve to D or B. For 4-3, C to B works. But C must be prepared. How to get C as a chord tone in V? V of G is D major, C is not a chord tone. So we need to use a different progression. Let's use I - IV - I. In G major: I = G B D, IV = C E G. In IV, the soprano can have G (5th of IV). Then on I, soprano holds G over G bass (unison? That's not a suspension — it's same pitch. Actually, G to G is no dissonance. So use a different suspension: soprano on IV has E (third of IV). Then on I, soprano holds E over G bass (6th above G — that's a 6th, a consonance? 6th is considered a consonance in common practice? Actually, 6th is imperfect consonant. But for a true suspension, we need a dissonance: 4th, 7th, or 9th. So 6th isn't used. So this isn't a traditional suspension.

To have a 4-3 suspension on I, the suspended note must be the fourth above the bass, which is C in G major. C must be prepared as a chord tone in the previous chord. That previous chord must contain C as a consonance. The most natural is IV (C major chord contains C). So let's write: I - IV - I with 4-3 on the final I.

• I: G B D G (soprano G).
• IV: C E G C (soprano C).
• I: G B D G? Wait, new I: we want soprano to hold C from IV, creating a 4th above G (C), then resolve to B (3rd). So:
• IV: C bass, E tenor, G alto, C soprano (soprano C is root, consonant). Then I: G bass, D tenor (5th), B alto (3rd), soprano holds C then moves to B.

Check: soprano C to B is a half step down — good. Interval from bass G to soprano C is a 4th (dissonant), then to B is a 3rd (consonant). The alto has B (3rd), soprano also goes to B — that doubles the third. That's acceptable but maybe not ideal. Could instead have tenor on B and alto on G? But let's keep for simplicity. This works.

Now check parallels: soprano C to B, alto B to? Wait, alto in I is B? In IV, alto is G? Actually above we said alto G in IV? Let's set IV: bass C, tenor E, alto G, soprano C. Then I: bass G, tenor D, alto B, soprano C->B. The alto moves from G to B (up a third). The tenor E to D (down a step). Bass C to G (up a fifth). No parallels between soprano and alto? Soprano C->B down step, alto G->B up third — they approach an octave? Not parallel. Soprano and tenor: soprano C->B, tenor E->D — both step down but not same interval? Actually C to B is half step, E to D is whole step, so not parallel. Soprano and bass: C to B vs C to G? Not parallel. Fine.

So the exercise demonstrates a proper 4-3 suspension.

Final Recommendation

To master suspensions in four-part voice leading, practice by writing short progressions (I-IV-I, I-V-I) with one suspension at a time. Start with the 4-3 in the soprano, as it's the most straightforward. Then try 7-6 in the alto or tenor, and eventually combine suspensions in different voices. Always analyze the interval between the suspended note and the bass — if it's a 4th, 7th, or 9th, you're on the right track. Check that the prepared note is a chord tone in the previous chord and that the resolution steps down to a chord tone. Avoid parallel perfect intervals and voice crossing. Use a music notation software or manuscript paper to visualize the SATB layout. With consistent practice, suspensions will become a natural part of your harmonic vocabulary.