| I | IV | V |
|---|---|---|
| Root | Perfect fourth | Perfect fifth |
| D | G | A |
The D Sus4 chord is composed of 3 notes :
These notes form a suspended chord with the fourth, generating tension that calls for resolution.
The sus4 chord D Sus4 replaces the third with the perfect fourth, creating tension that naturally calls for resolution to the major chord.
The perfect fourth (5 semitones) creates a soft dissonance demanding resolution, making the chord perfect for creating harmonic movement.
For sus4 chords on piano:
The sus4 chord is a rock pillar:
Classic rock: defines 70s sound (The Who, Led Zeppelin).
Pop-rock: adds movement and energy.
Country and folk: ornaments and transitions.
Gospel: plagal cadences (IV-I and IVsus4-I).