Skip to content
piano.org
A piano reference: chords, scales, theory & ear training.
/
Spotted something? Leave a note ↓

A Major 9♯11

chord·/chords/major-9th-sharp-11th/a/

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

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

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

Jump to any CHORD
Piano Deck · Chord
Three quick cards on A Major 9♯11
Answer on the keyboard, not with buttons. No login required.
A
A – B – C♯ – D♯ – E – G♯

Practice A Major 9♯11

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

Chord Drill →Timed drills — build speed and recognitionPractice Room →Plug in a MIDI keyboard for real-time feedback

Introduction

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

Notes

Notes:A – B – C♯ – D♯ – E – G♯

Key Signature

A chord has no key signature of its own, but the A Major 9♯11 is the tonic (I) chord of A Major, whose key signature has 3 sharps (F♯, C♯, G♯).

F♯C♯G♯

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 A Major

These are the triads built on each degree of the A major scale:

C1C2C3C4AC5EC6C7C8C#
I — A Major (major)
DegreeNumeralChordQuality
1IA MajorMajor
2iiB MinorMinor
3iiiC♯ MinorMinor
4IVD MajorMajor
5VE MajorMajor
6viF♯ MinorMinor
7vii°G♯ DiminishedDiminished

A Major 9♯11 — Frequently Asked Questions

What is the A Major 9♯11 chord on piano?
The A Major 9♯11 chord contains the notes A – B – C♯ – D♯ – E – G♯. 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

    Beethoven, Ludwig van(1810)

    Für Elise, WoO 59 (A minor)

    Public domain score
  4. 4

Spot something that looks off? Use the note form below — corrections are reviewed by hand.

Leave a note

Spotted a typo, have a question, or want to add something? We read every note.

0 / 1000