The i iv Minor Vamp
The Minor Pendulum alternates i7 and iv7. In A minor, play Am7 and Dm7. Two notes remain common while two others move by step, making the loop smooth enough to support a long groove.
- 2 chords
- Am7 Dm7
- A and C stay common
same family
The progression
- i7
- iv7
Map the voices
| Chord | Notes | Common tones | Moving tones |
|---|---|---|---|
| Am7 | A C E G | A C | E G |
| Dm7 | D F A C | A C | D F |
From Am7 to Dm7, E falls to D and G falls to F. On the return, both rise by a whole tone. Close voicings make these two parallel moves easy to see and hear.
Which chord is home?
Am7 is i7 and usually receives tonic weight from repetition, bass emphasis and melodic arrival on A. Dm7 is iv7 and moves away from that centre.
The absence of E7 means the loop has no strong dominant-to-tonic cadence. Am can still function as home; tonal centre does not require every phrase to use a leading tone.
Natural minor or Dorian?
Dm7 contains F natural, the flat sixth of A natural minor. Replace it with D7 or D major and F becomes F-sharp, giving the loop a Dorian colour.
Compare Am7-Dm7 with Am7-D7. Hold A and C where possible and listen specifically to F versus F-sharp.
Make rhythm carry the form
- One chord per barestablish the basic pendulum.
- Delay iv7keep Am7 for three bars and use Dm7 only in bar 4.
- Syncopate the returnplace Am7 before the downbeat.
- Thin the textureremove notes before adding filter, register or rhythmic changes.
Make it yours
- Move the bass independently
Try A-C-D-E beneath the same upper voicings and notice how the chord interpretation shifts.
- Change inversion on each repeat
Keep the symbols Am7-Dm7 while creating a longer upper-line melody.
- Reserve full voicings
Begin with roots and sevenths, then add thirds and fifths when the section grows.
When it is useful
Use this two-chord vamp when vocals, drums, bass or sound design should carry the development. Its stable harmonic frame gives rhythmic and timbral changes room to register.