Constant-structure harmony repeats the same chord quality on different roots. Instead of letting the key change each chord into a different quality, you move one shape as a block.
A sequence such as C major–D major–E major keeps the major-triad shape. It leaves C major's diatonic collection, so the sound is coloristic rather than a standard in-key progression.
Keep the quality fixed
Move the shape up to E major, then choose a landing chord that makes the change feel intentional.
Try it
- Choose one chord quality: major, minor, diminished, or another clear shape.
- Move it through a short root pattern without changing its intervals.
- Resolve or contrast the pattern with a chord that re-establishes the track's tonal center.
Key takeaway
Constant structure prioritizes chord color and shape over diatonic function. A clear root path and a deliberate landing keep it musical.