The G Add 9 chord is a four-note chord made up of G, B, D, and A. It is built from a root, major third, perfect fifth, and major ninth.
Construction
G Add 9 = Root + Major 3rd + Perfect 5th + Major 2nd = G · B · D · A
| Note | Interval | Degree |
|---|---|---|
| G | Root | 1 |
| B | Major 3rd | 3 |
| D | Perfect 5th | 5 |
| A | Major 2nd | 2 |
G Add 9 Inversions
| Position | Notes |
|---|---|
| Root Position | G – B – D – A |
| 1st Inversion | B – D – G – A |
| 2nd Inversion | D – G – A – B |
| 3rd Inversion | G – A – B – D |
Key Signature
A chord has no key signature of its own, but the G Add 9 is the tonic (I) chord of G Major, whose key signature has 1 sharp (F♯).
F♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic: Father Charles Goes Down And Ends Battle
Chords in the Key of G Major
These are the triads built on each degree of the G major scale:
Same Notes, Other Names
The notes G – B – D – A aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
G Add 9 — Frequently Asked Questions
What is the G Add 9 chord on piano?
The G Add 9 chord contains the notes G – B – D – A. On piano, play these notes together to sound the chord.
What notes are in the G Add 9 chord?
The G Add 9 chord (Gadd9) contains four notes: G (root), B (major third), D (perfect fifth), and A (major ninth). No seventh — the ninth adds brightness and openness to the triad.
How does Gadd9 differ from G9?
Gadd9 has no seventh. G9 includes the minor seventh (F). Gadd9 sounds bright and open; G9 sounds bluesy and dominant.
How is Gadd9 used in music?
Gadd9 is one of the most popular chords in acoustic pop and rock. G Major is the most common guitar key, and adding the ninth creates the bright, jangly sound heard in countless hits.
What songs use add9 chords?
Wonderwall (Oasis) features Gadd9-like shapes prominently. Good Riddance (Green Day), Yellow (Coldplay), and many acoustic songs use add9 voicings for their bright, open quality.
How does Gadd9 differ from Gsus2?
Both contain G and A. Gadd9 keeps B (major third); Gsus2 replaces it. Gadd9 is major with colour; Gsus2 is ambiguous.
Can I substitute Gadd9 for G Major?
Yes — Gadd9 replaces G Major beautifully in pop, rock, and folk. It is one of the most common substitutions in modern music.