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B 9♯11

chord·/chords/9-sharp-11/b/

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

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

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

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B
B – C♯ – D♯ – E♯ – F♯ – A

Practice B 9♯11

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Introduction

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

Notes

Notes:B – C♯ – D♯ – E♯ – F♯ – A

Key Signature

A chord has no key signature of its own, but the B 9♯11 is the tonic (I) chord of B Major, whose key signature has 5 sharps (F♯, C♯, G♯, D♯, A♯).

F♯C♯G♯D♯A♯

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 B Major

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

C1C2C3C4BC5C6C7C8D#F#
I — B Major (major)
DegreeNumeralChordQuality
1IB MajorMajor
2iiC♯ MinorMinor
3iiiD♯ MinorMinor
4IVE MajorMajor
5VF♯ MajorMajor
6viG♯ MinorMinor
7vii°A♯ DiminishedDiminished

B 9♯11 — Frequently Asked Questions

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

    George Grove (ed.)(1900)

    A Dictionary of Music and Musicians

    Public domain treatise
  2. 2

    Jadassohn, Salomon(1883)

    A Manual of Harmony

    Public domain treatise
  3. 3

    Prout, Ebenezer(1889)

    Harmony: Its Theory and Practice

    Public domain treatise
  4. 4

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