D Add 9
Jump to any chord
Listen plays the chord. Play Along lights up each note in order so you can follow.
Dadd9
D – F♯ – A – E
Formula:R-M3-P5-M9
Intervals:P1-M3-P5-M9
Scale Degrees:1-3-5-9
Introduction
The D Add 9 chord is a four-note chord made up of D, F♯, A, and E. It is built from a root, major third, perfect fifth, and major ninth.
Notes
D Add 9 Inversions
| Position | Notes |
|---|---|
| Root Position | D – F♯ – A – E |
| 1st Inversion | F♯ – A – D – E |
| 2nd Inversion | A – D – E – F♯ |
| 3rd Inversion | D – F♯ – A – E |
Key Signature
The key of D Add 9 has 2 sharps.
F♯C♯
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 D Major
These are the diatonic triads built on each degree of the D major scale:
C
D
E
F
G
A
B
C
D
E
F
G
A
B
I — D Major (major)
Theory: Intervals
Formula: R-M3-P5-M9
Intervals: P1-M3-P5-M9
The D Add 9 is built by stacking intervals from the root note. The formula R-M3-P5-M9 describes the scale degrees used. The intervals P1-M3-P5-M9 show the distance between each note in the chord.
D Add 9 — Frequently Asked Questions
What notes are in the D Add 9 chord?
The D Add 9 chord (Dadd9) contains four notes: D (root), F# (major third), A (perfect fifth), and E (major ninth). No seventh — the ninth is added directly to the major triad for a bright, open sound.
How does Dadd9 differ from D9?
Dadd9 has no seventh (D–F#–A–E). D9 includes the minor seventh (D–F#–A–C–E). Dadd9 is bright and open; D9 is bluesy and dominant.
How is Dadd9 used in music?
Dadd9 is one of the most popular acoustic chords. It substitutes for D Major in pop, rock, and folk. The open E string on guitar means Dadd9 is heard in countless acoustic songs.
What songs use add9 chords?
Add9 chords appear in Wonderwall (Oasis), Good Riddance (Green Day), Yellow (Coldplay), and many acoustic songs. Dadd9 is particularly common in acoustic guitar-driven music.
How does Dadd9 differ from Dsus2?
Both contain D and E. But Dadd9 keeps F# (major third), while Dsus2 replaces it with E. Dadd9 is major with colour; Dsus2 is ambiguous.
Can I substitute Dadd9 for D Major?
Yes — Dadd9 replaces D Major beautifully in almost any context. The added ninth (E) provides shimmer without changing function.
Practice Tips
- Play D Major then add E above — hear the bright shimmer the ninth brings.
- Dadd9 is one of the most common chords in acoustic music — practice it until the shape is automatic.
- Compare Dadd9 with Dsus2 — the major third (F#) in Dadd9 gives it a definite major identity.
- Try the classic progression: G → Dadd9 → Em7 → Cadd9 for an instantly recognisable acoustic pop sound.
- Practice voicing with E on top for maximum brightness.
- Dadd9 → D → Dadd9 creates a subtle movement that works as a verse pattern in many songs.
Related Tools
Chord FinderLook up any chord — see the notes, hear it, and play along.Chord DrillTimed drills to build speed and recognition across all chord types.Practice RoomPlug in a MIDI keyboard and get real-time feedback on every chord and scale.Circle of FifthsVisualize key relationships, relative minors, and key signatures.MIDI MonitorLive MIDI message stream with note names, velocity, and a scrolling staff.