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Harmony

Suspension

A suspension is a note that is already there before the chord tone it belongs to sounds. It falls on a strong beat, forms a tension with the chord and then usually resolves a step downward into the actual chord tone.

Type
non-chord tone, delays the chord tone
Usually on
a strong beat
Resolution
by step, usually downward
Counterpart
passing note

Tension in miniature

The page Cadences describes the basic arc of harmony: the dominant builds tension, the tonic releases it. The suspension applies the same principle to a single note. It delays the expected chord tone and so makes the resolution audible.

Suspension F over C major: F resolves to E

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In the first bar the F is a chord tone, for example over F major. In the second bar the chord changes to C major (C–E–G), but the F stays on the strong first beat instead of making way for the chord tone E. Only on the third beat does the melody reach the E. The second F is the marked suspension.

C with FSuspensionCResolution

In the first chord the F rubs against G; only in the second are all the notes chord tones. Like a build-up and release.

Suspension or passing note?

Both are non-chord tones, but they sound different because they fall on different beats.

Passing noteSuspension
Beatweakstrong
Preparationnone neededthe note is often already in the chord before
Resolutioncarries straight onresolves a step, usually downward
Effectflowingtense, then relaxed

That is the general textbook distinction. Strong and weak beats are explained on the page Rhythm.

How a suspension works

The article The leading tone describes how a single semitone pulls into a target note. With the suspension it is the same: the note is not wrong, it just wants to move on. When you play it, do not leave it too quickly, so that the tension can be heard.

Try it yourself: First play only the C major chord and then the chord with F instead of E. Sing the F along and lead it slowly to E. You hear the tension resolve.