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Verse · Technique · 1 Oct 2026 · By The Song Desk

Seven Ways to Vary One Chord Loop Without Changing a Chord

在一个和弦都不改的前提下变化同一个循环的七种方法 — 用中文读这一篇

One chord loop repeated for the whole song is a strong device, but only if the repetitions are not identical. This is a set of seven variations you can apply to a four-chord loop without changing a single chord, ordered roughly from least to most disruptive.

Key / scaleA minor (Am–G–F–G) with a modified second pass
Rhyme schemeABCB
Form40 bars · 5 parts
StageVerse

Song structure

40 bars
  1. VERSE
  9. VERSE
  17. CHORUS
  25. VERSE
  33. CHORUS
  1. 1
  5. 5
  9. 9
  13. 13
  17. 17
  21. 21
  25. 25
  29. 29
  33. 33
  37. 37
Structure strip for Seven Ways to Vary One Chord Loop Without Changing a Chord: Verse 8 bars, Verse 8 bars, Chorus 8 bars, Verse 8 bars, Chorus 8 bars
Segments drawn to scale in bars, with the bar ruler underneath.

The seven variations

Apply them one at a time. Two at once is usually enough to make the loop unrecognisable, which defeats the point of having a loop.

#VariationEffect
1Displacement — move the whole loop one beat earlierGroove feels urgent, almost like a mistake
2Truncation — drop the last bar and go straight back to bar oneTightens a verse that overstays
3Extension — hold the first chord for two extra barsCreates a pre-chorus substitute for free
4Inversion — same chords, bass note moved to the thirdSoftens a chorus without changing harmony
5Suspension — add a suspended fourth to one chord onlyAdds a small unresolved ache in one place
6Arpeggiation — block chords become a broken patternSeparates verse two from verse one audibly
7Removal — take out the third chord entirelyMakes space; usually best in the last verse

Order matters more than selection

The variations should accumulate as the song goes on, not reset. If verse one is a plain loop, verse two should be the loop plus one variation, and the last verse should be the loop plus two or three. A song that uses variation 5 in verse one and variation 1 in verse two has no arc — it has two unrelated sections over the same chords.

The one exception is truncation, which is best used exactly once and usually in the final verse, where losing a bar reads as the song running out of patience.

What not to vary

Keep the bass movement and the bar-one chord constant across every verse. Those two things are what tell the listener they are in the same song; change them and you have written a new section, which is a different (and legitimate) decision, but you should make it knowingly.

  • Keep the downbeat of bar one the same in every verse.
  • Keep the tempo identical — a 2 bpm drift between verses is audible as sloppiness.
  • Do not add a chord. If you find yourself wanting to, use variation 3 or 7 instead.

A worked sequence

In the draft this was written from — Am–G–F–G, three verses, one chorus repeated — the sequence used was: verse one plain; verse two with the loop displaced by one beat; verse three with the loop truncated to three bars and the F removed for the first half. The chorus used variation 4 (inversions in the bass) so it sat at the same dynamic level as the verses but with a completely different colour.

Total chord changes across the whole song: zero. Total arrangement changes: four. That ratio is the point.

Carry these

  1. Seven loop variations — displacement, truncation, extension, inversion, suspension, arpeggiation, removal — none of which change a chord.
  2. Accumulate variations across the song rather than resetting them.
  3. Keep the bar-one downbeat and the tempo constant so the listener still hears one song.

Questions that come up here

Do these variations work in a two-chord loop?

All except suspension and removal, which need a third chord to operate on. Displacement and truncation are actually more effective in a two-chord loop, because there is less information for the listener to track and the rhythmic change is the only event available.

How do I notate which variation goes where?

Write the variation number in the margin next to the section heading on the lyric sheet — for example 'V2: +disp' and 'V3: +trunc, -F'. Keep it to two characters if you can. Full notation invites you to over-plan a section you have not heard yet.

Same workbench

Spotted something wrong, or know a record this example comes from? Write to [email protected], or use the contact page.

The two languages here are written separately rather than translated line by line, so the examples and the working vocabulary differ where the language does.

This is a working notebook on songwriting craft, not professional advice. What follows describes what happened in particular songs — test it at your own desk rather than reading it as a rule for your music.