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Harmony

Non-chord tone

A non-chord tone is a note that does not belong to the chord sounding at that moment. It acts like a small dissonance and usually moves on to a chord tone after a short time. Well-known kinds are the passing note, neighbour note, suspension, anticipation and after-note.

Feature
does not belong to the chord
Resolution
usually by step into a chord tone
Kinds
passing note, neighbour note, suspension, anticipation, after-note
Effect
heavier on a strong beat, lighter on a weak one

Notes that do not belong to the chord

Only its own notes belong to a chord: in the C major chord these are C, E and G. All other notes sounding above it in the melody are non-chord tones. They act like small dissonances and usually move on to a chord tone after a short time. That way they enliven a melody and join the chord tones to one another.

Passing note: fills the space between two chord tones

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Over C major (C–E–G) the melody goes E–D–C. In the marked chord the D does not belong to the chord, it joins E and C by step.

Neighbour note: there and back

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The melody goes from E to the neighbour note F and returns to E. In the marked chord the F is a non-chord tone.

Suspension: the chord tone is delayed

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The F lies in the F major chord (prepared). At the change to C major, on beat one of the second bar, the melody stays on F. Now it is a non-chord tone in the marked chord and resolves downwards into E after two beats. The suspension falls on the strong beat, which is why it sounds weighty.

Anticipation: the next chord tone comes too early

4 4

Over the G major chord the C of the following tonic already sounds. In the marked chord the C is a non-chord tone for G major, a chord tone for the next chord.

In the glossary: Passing note · Suspension · Triad

Position in the bar decides

The effect depends on the position in the bar. On a strong beat non-chord tones sound weightier than on a weak one. A passing note on the weak beat runs by almost unnoticed, a suspension on the strong beat creates tension that resolves.

And the rest?

A note that fits the key can also be a non-chord tone, as long as it is not part of the current chord. The D in the passing note belongs to the C major scale but not to the C major chord. Non-chord tones differ from modulation, where the harmonic reference point changes, in that the harmony stays and only a single note is foreign.

Practice: Play a melody over a held C major chord and mark in the notation which notes belong to C–E–G and which do not. Listening works best if you let the chord ring. In Melodic Dictation you can write down such lines by ear.