AP® Music Theory · Unit 5 · Topic 5.7
Metric Placement of Six-Four Chords
The same six-four chord gets different names depending on where it falls in the measure. A strong-beat six-four before V is cadential; a weak-beat one is usually passing or pedal.
A six-four chord is really a decoration of another chord, and what it decorates depends on timing. Put it on a strong beat, right before the dominant, with scale degree 5 in the bass resolving down by step into V, and it reads as a cadential six-four: a delay that makes the dominant's arrival feel earned. Put that same chord shape on a weak beat, moving stepwise between two positions of the same harmony, and it is a passing six-four. Put it over a bass note that stays put while upper voices shift, and it is a pedal six-four. The chord tones can look identical on paper. The label comes from where the chord sits in the measure and what happens around it.
This matters because six-four chords are unstable by nature, built on the weakest spacing of a triad. Theory only tolerates that instability in specific, controlled situations, and metric placement is one of the controls. A six-four stuck on beat 1 before V does its job as a suspension-like gesture because the strong beat gives it weight. Strip away the strong beat, the scale-degree-5 bass, or the stepwise resolution, and adjacency to V alone is not enough to call it cadential, even if it looks similar in the score.
This connects directly to the metric grid built in the rhythm unit: strong and weak beats are not just about accent, they carry harmonic meaning here. Recognizing a six-four's function means reading the full context, beat placement, bass line motion, and surrounding chords together, rather than naming a chord from its stack of notes alone.
Key terms
- cadential six-four
- A strong-beat six-four chord built on scale degree 5 that resolves stepwise into the dominant.
- passing six-four
- A weak-beat six-four that connects two positions of the same harmony through stepwise bass motion.
- pedal six-four
- A six-four formed when upper voices move over a bass note that stays fixed.
- metric placement
- Whether a chord falls on a strong or weak beat, which affects how its harmonic function is heard.
Watch it explained
- How it worksHow does a strong-beat six-four become cadential while a weak-beat one turns passing or pedal?
- Worked exampleFind whether a six-four on beat 1 followed by the dominant on beat 2 is cadential or pedal.
- Common mistakeWhy doesn't every six-four chord that comes before the dominant count as cadential?
- Ties togetherHow does the metric grid from the rhythm unit decide which six-four label is correct?
Check yourself
End of topic.