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The problem it solves
If a melody always leaps from chord tone to chord tone, it sounds angular and full of gaps. Passing tones fill those leaps by step and make the line move naturally and smoothly.
Detailed theory
Key idea
A passing tone connects two chord tones by step (one step at a time), in a single direction: C-D-E.
It does not belong to the chord, falls on a weak beat and creates a brief, fleeting tension that resolves immediately into the next chord tone.
Understand it
Imagine you have two chord tones separated by a small leap, like C and E over a C chord. Instead of jumping straight from one to the other, you can fill the gap with the note in between: the D. That D is a passing tone.
What defines it is that it connects two stable notes by step — one step at a time, no leaps — and in a single direction (it rises C-D-E or falls E-D-C, but does not turn back). The passing tone does not belong to the current chord: it is an outside note that is only there in passing.
That is why it usually falls on a weak beat, between two strong pulses. Its tension is brief and fleeting: the moment it sounds it is already heading toward the next chord tone, where it resolves at once. It is a passing tension, not a point where the melody stays.
The result is a smooth, natural stepwise motion. The line stops making angular leaps and flows from one chord tone to another through the passing tone, like someone filling the space between two stepping stones with a light step that only brushes the water.
Tell it apart from a direct leap: C-E is a leap that uses no passing tone; C-D-E is the same journey filled in with the passing tone D. The passing tone is therefore a connecting tool, not a destination: it serves to reach the next stable point smoothly.
Staff & keyboard
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Contrast: the direct leap C→E (no passing tone) and the same journey filled in, C-D-E, where the D passes by step.
How to recognise it
How it's written
Look for a note that sits between two chord tones, a step away from both and on a weak beat: if it connects the two stable notes moving in the same direction (like the D in C-D-E), it is a passing tone.
How it feels
Listen to C-D-E over a C chord: the D sounds like a light bridge, a passing tension that quickly resolves into the E. It does not stop there; it just connects the two stable notes.
Common mistake
Putting the passing tone on a strong beat and leaving it unresolved: then it no longer sounds in passing and comes across as a wrong note over the chord.
Confusing it with a leap or with a chord tone: the passing tone always moves by step and does not belong to the current chord.
Try it
Over a C chord, play the leap C-E and then fill it with the passing tone: C-D-E. Feel how the second version flows more smoothly.
Try going down: E-D-C over the C chord, noticing that the D falls on a weak beat and resolves at once into the C.
On the instrument
Staff & keyboard
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C-D-E over a C chord: C and E are chord tones (stable points) and the D is the passing tone that connects them by step.
Where it's used
- Smoothing a melody’s leaps
- Filling the space between two chord tones with a passing tone to move by step.
- Giving a bass line flow
- Connecting the bass’s stable notes with passing tones so they walk naturally.
- Analysing a melody
- Telling chord tones (stable) apart from passing tones (connecting, on weak beats).
Examples
Staff & keyboard
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An ascending line C-D-E-F-G over C: C, E and G are chord tones and D and F are passing tones that connect by step.
Prepares you for
Exercises
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What is a passing tone?