| I | III | IV | V |
| Root | Major third | Perfect fourth | Perfect fifth |
| A | C# | D | E |
The A Add4 chord is composed of 4 notes :
These notes form a major chord with added fourth, creating rich tension without suspension.
The add4 chord A Add4 combines the major triad with the added perfect fourth, without seventh.
The simultaneous presence of third and fourth creates a particular cluster, offering an alternative to sus4 with a more complete character.
The add4 chord has specific uses:
Progressive rock: complex and rich harmonies.
Modal jazz: exploits lydian mode colors.