C♯9♯11: C♯/D♭ Dominant 9th Sharp 11th Piano Chord

Construction

C♯ 9♯11 = Root + Major 3rd + Perfect 5th + Minor 7th + Major 2nd + Diminished 5th = C♯, E♯, G♯, B, D♯, F♯♯

Note	Interval	Degree
C♯	Root	1
E♯	Major 3rd	3
G♯	Perfect 5th	5
B	Minor 7th	♭7
D♯	Major 2nd	9
F♯♯	Diminished 5th	♭5

Key Signature

A chord has no key signature of its own, but the C♯ 9♯11 is the tonic (I) chord of C♯ Major, whose key signature has 7 sharps (F♯, C♯, G♯, D♯, A♯, E♯, B♯).

F♯C♯G♯D♯A♯E♯B♯

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 C♯ Major

These are the triads built on each degree of C♯ Major:

I — C♯ Major (major)

Degree	Numeral	Chord	Quality
1	I	C♯ Major	Major
2	ii	D♯ Minor	Minor
3	iii	E♯ Minor	Minor
4	IV	F♯ Major	Major
5	V	G♯ Major	Major
6	vi	A♯ Minor	Minor
7	vii°	B♯ Diminished	Diminished

C♯ 9♯11 : Frequently Asked Questions

What is the C♯ 9♯11 chord on piano?

The C♯ 9♯11 chord contains the notes C♯ – E♯ – G♯ – B – D♯ – F♯♯. On piano, play these notes together to sound the chord.

What is the C# piano chord?

The C# piano chord (written C♯ 9♯11) uses the same keys: C♯ – E♯ – G♯ – B – D♯ – F♯♯. The # and ♯ symbols name the same black key.