The D♯ 9sus4 chord is a five-note chord made up of D♯, G♯, A♯, C♯, and E♯. It is built from a root, perfect fourth, perfect fifth, minor seventh, and major ninth.
Construction
D♯ 9sus4 = Root + Perfect 4th + Perfect 5th + Minor 7th + Major 2nd = D♯ · G♯ · A♯ · C♯ · E♯
| Note | Interval | Degree |
|---|---|---|
| D♯ | Root | 1 |
| G♯ | Perfect 4th | 11 |
| A♯ | Perfect 5th | 5 |
| C♯ | Minor 7th | ♭7 |
| E♯ | Major 2nd | 9 |
Key Signature
A chord has no key signature of its own, but the D♯ 9sus4 is the tonic (I) chord of D# Major, whose key signature has 3 flats (B♭, E♭, A♭).
B♭E♭A♭
Order of flats
Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.
B♭E♭A♭D♭G♭C♭F♭
Mnemonic: Battle Ends And Down Goes Charles’ Father
Chords in the Key of D♯ Major
These are the triads built on each degree of the D♯ major scale:
Same Notes, Other Names
The notes D♯ – G♯ – A♯ – C♯ – E♯ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
D♯ 9sus4 — Frequently Asked Questions
What is the D♯ 9sus4 chord on piano?
The D♯ 9sus4 chord contains the notes D♯ – G♯ – A♯ – C♯ – E♯. On piano, play these notes together to sound the chord.
What notes are in the D# 9sus4 chord?
The D# 9sus4 chord (D#9sus4) contains 5 notes: D#, G#, A#, C#, F. Formula: R-P4-P5-m7-M9.
How is D#9sus4 used in music?
D#9sus4 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for D#9sus4?
D#9sus4 uses scale degrees 1-4-5-b7-9, giving it its distinctive sound.