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A suspension is a nonharmonic tone created by sustaining a note from a previous chord into a new chord where it doesn't belong, creating dissonance that must resolve downward by step. Suspensions require three elements: preparation (the note belongs to the previous chord), suspension (the note clashes with the new chord), and resolution (the note descends to a chord tone). Suspensions are labeled by the intervals involved (4–3, 7–6, 2–3). They create rhythmic and harmonic interest in voice leading.
You've already encountered non-chord tones — pitches that don't belong to the prevailing harmony but appear briefly and then move on. Among all non-chord tones, the suspension holds a special place because it operates in the dimension of time as much as pitch: it's not merely a pitch that clashes with the harmony, but a pitch from the *past* that refuses to leave when the harmony changes. This creates a distinctive emotional quality — longing, unresolved tension — that composers have exploited for centuries.
The three-stage structure of a suspension maps directly onto narrative. In the preparation, the note belongs to the chord and sounds entirely stable — there is no tension yet. When the harmony changes beneath it, the suspended note is held over against the new chord, creating a clash. This is the suspension itself: the dissonance of the old against the new. The ear hears the clash and anticipates resolution. Then the resolution arrives: the suspended note moves down by step to the chord tone it was delaying, and the tension releases. The journey from stability through tension to release gives suspensions their expressive power.
The labeling system (4–3, 7–6, 9–8, 2–3 bass) tells you exactly which intervals are involved. A 4–3 suspension means the suspended note forms a fourth above the bass during the suspension, then resolves to a third. A 7–6 means the suspended note forms a seventh, resolving to a sixth. The bass suspension (2–3) resolves upward, unusually — but the principle is the same: a clash that demands and receives resolution. When you encounter a suspension label, you can predict both the dissonance and its resolution without even hearing the music.
Suspensions also reveal something important about how voice leading and rhythm interact. The suspended note typically falls on a metrically strong beat (where the new harmony arrives), and the resolution falls on a weak beat. This rhythmic placement intensifies the dissonance — the tension lands where the listener is already oriented to pay attention. This is why voice-leading principles are inseparable from rhythm: the same interval can sound like a passing dissonance or a meaningful suspension depending entirely on its metric position. As you move into more advanced voice leading, you'll find that the preparation-suspension-resolution pattern is a template for understanding a wide range of harmonic events, not just the formally labeled suspensions.
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