Play the add4 chord on piano
The add4 chord enriches the major triad with a perfect fourth, creating a modal color while keeping the major third, unlike sus4.
Chord composition
| I | III | IV | V |
| Root | Major third | Perfect fourth | Perfect fifth |
| 0 | 4 | 5 | 7 |
Formula 1 - 3 - 4 - 5
Theory
The add4 chord combines major third and perfect fourth. C add4 = C-E-F-G, F add4 = F-A-B♭-C. The proximity between third and fourth (1 semitone) creates a characteristic tension. This chord is rare but used for specific modal colors in rock and pop.
Play the add4 chord on the piano
