The B 9♯11 chord is a six-note chord made up of B, C♯, D♯, E♯, F♯, and A.
Construction
B 9♯11 = Root + Major 2nd + Major 3rd + Diminished 5th + Perfect 5th + Minor 7th = B · C♯ · D♯ · E♯ · F♯ · A
| Note | Interval | Degree |
|---|---|---|
| B | Root | 1 |
| C♯ | Major 2nd | 9 |
| D♯ | Major 3rd | 3 |
| E♯ | Diminished 5th | ♭5 |
| F♯ | Perfect 5th | 5 |
| A | Minor 7th | ♭7 |
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:
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.