Construction
C♯ 7♯9 = Root + Major 3rd + Perfect 5th + Minor 7th + Minor 3rd = C♯, E♯, G♯, B, D♯♯
| Note | Interval | Degree |
|---|---|---|
| C♯ | Root | 1 |
| E♯ | Major 3rd | 3 |
| G♯ | Perfect 5th | 5 |
| B | Minor 7th | ♭7 |
| D♯♯ | Minor 3rd | ♭3 |
Fingering
| Note | Key color | Right hand | Left hand |
|---|---|---|---|
| C♯ | black | thumb (1) | little finger (5) |
| E♯ | white | index finger (2) | ring finger (4) |
| G♯ | black | middle finger (3) | middle finger (3) |
| B | white | ring finger (4) | index finger (2) |
| D♯♯ | white | little finger (5) | thumb (1) |
Right hand: thumb (1) on C♯, index finger (2) on E♯, middle finger (3) on G♯, ring finger (4) on B, little finger (5) on D♯♯.
Left hand: little finger (5) on C♯, ring finger (4) on E♯, middle finger (3) on G♯, index finger (2) on B, thumb (1) on D♯♯.
Key Signature
A chord has no key signature of its own, but the C♯ 7♯9 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:
C♯ 7♯9 : Frequently Asked Questions
What is the C♯ 7♯9 chord on piano?
The C♯ 7♯9 chord contains the notes C♯ – E♯ – G♯ – B – D♯♯. On piano, play these notes together to sound the chord.
What is the C# piano chord?
The C# piano chord (written C♯ 7♯9) uses the same keys: C♯ – E♯ – G♯ – B – D♯♯. The # and ♯ symbols name the same black key.
What notes are in the C# 7♯9 chord?
The C# 7♯9 chord (C#7♯9) contains 5 notes: C#, F, G#, B, E. Formula: R-M3-P5-m7-A9.
How is C#7♯9 used in music?
C#7♯9 is used in jazz, fusion, and contemporary music to add harmonic color. It appears as a dominant or tonic chord depending on context.
What is the scale degree formula for C#7♯9?
C#7♯9 uses scale degrees 1-3-5-b7-#9, giving it its distinctive sound.