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D♯ 9♯11

chord·/chords/9-sharp-11/d-sharp/

The D♯ 9♯11 chord contains the notes D♯, E♯, F♯♯, G♯♯, A♯, and C♯.

Notes: D♯, E♯, F♯♯, G♯♯, A♯, C♯ · Piano keys: D♯ E♯ F♯♯ G♯♯ A♯ C♯

Reviewed for accuracy · Last updated July 2026 · Maintained by Justin Evans

E♭ 9♯11
This is the same chord as E♭ 9♯11 — the same keys on the keyboard, spelled with flats.
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D♯
D♯ – E♯ – F♯♯ – G♯♯ – A♯ – C♯

Practice D♯ 9♯11

Reading about it is one thing. Drilling it is what makes it automatic.

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Introduction

The D♯ 9♯11 chord is a six-note chord made up of D♯, E♯, F♯♯, G♯♯, A♯, and C♯.

Notes

Notes:D♯ – E♯ – F♯♯ – G♯♯ – A♯ – C♯

Key Signature

A chord has no key signature of its own, but the D♯ 9♯11 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:

C1C2C3C4GC5C6C7C8D#A#
I — D♯ Major (major)
DegreeNumeralChordQuality
1ID♯ MajorMajor
2iiF MinorMinor
3iiiG MinorMinor
4IVG♯ MajorMajor
5VA♯ MajorMajor
6viC MinorMinor
7vii°D DiminishedDiminished

D♯ 9♯11 — Frequently Asked Questions

What is the D♯ 9♯11 chord on piano?
The D♯ 9♯11 chord contains the notes D♯ – E♯ – F♯♯ – G♯♯ – A♯ – C♯. On piano, play these notes together to sound the chord.

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.

References & Further Reading

The note names, intervals, fingering, and harmony on this chord page are grounded in the following sources. Public domain treatises and scores are linked to their full text; primary data reflects piano.org's own interval-derived dataset.

  1. 1

    Jadassohn, Salomon(1883)

    A Manual of Harmony

    Public domain treatise
  2. 2

    Prout, Ebenezer(1889)

    Harmony: Its Theory and Practice

    Public domain treatise
  3. 3

    Goetschius, Percy(1889)

    The Material Used in Musical Composition

    Public domain treatise
  4. 4

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