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F♯7♯9 Chord: Guitar, Piano and Notes

The F♯7♯9 chord is a altered dominant seventh chord built on the root note F♯. Its notes are F♯, A♯, C♯, E and G𝄪. It's enharmonically the same chord as G♭7♯9.

Transpose
Quality
Short answer

Dominant seventh sharp nine chords sound gritty and bluesy at once, the clash of a major third against a sharp ninth that reads to the ear like a minor third. Funk, rock and soul horn sections lean hard on this one chord.

Notes
F♯ · A♯ · C♯ · E · G𝄪
Formula
1 · 3 · 5 · ♭7 · ♯9
Semitones
0 · 4 · 7 · 10 · 15
Note
F♯
Quality
Dominant 7♯9
Symbol
F♯7♯9

F♯7♯9 on piano

5 notes
View:
Piano diagram of the F♯7♯9 chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

To play F♯7♯9 on piano, place your right hand with your thumb on F♯, index finger on A♯, middle finger on C♯, ring finger on E and little finger on G𝄪. Press the keys together and listen for an even sound. On the keyboard F♯, A♯ and C♯ are black keys and E and G𝄪 are white. G𝄪 is the key you'd normally call A. The thumb starts on a black key, so slide the whole hand a little further in, towards the fallboard. Practice moving in and out of the chord slowly, then bring in a metronome.

  • F♯1
  • A♯3
  • C♯5
  • E♭7
  • G𝄪♯9

F♯7♯9 on guitar

View:
Guitar chord diagram of the F♯7♯9 chord

Switch to the interactive diagram to hear the chord, change voicing and swap finger numbers for note names.

On guitar, F♯7♯9 is commonly played with the voicing shown above. The fretted notes sit between frets 1 and 2. String 1 rings open.

F♯ · A♯ · C♯ · E · G𝄪

Play F♯7♯9 on the online piano

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F♯7♯9 chord notes

Also known as G♭7♯9

DegreeIntervalSemitonesNoteHear
1Root0F♯(F#)
3Major third4A♯(A#)
5Perfect fifth7C♯(C#)
♭7Minor seventh10E
♯9Augmented ninth15G𝄪(G##)

How to use the F♯7♯9 chord

The F♯7♯9 chord is built from a root, a major third, a perfect fifth, a minor seventh and an augmented ninth. Start at the root F♯ and stack the intervals to get the whole chord: F♯, A♯, C♯, E and G𝄪. The same formula gives you the chord in any other key.

Dominant seventh sharp nine chords drive funk, blues-rock and fusion as the tonic of a dominant-based vamp, not only as a V chord. Whole grooves in soul and rock guitar are built around this one chord.

How F♯7♯9 differs from similar chords

F♯7♯9 holds both a major third and a raised ninth that sounds like a minor third, so it is major and minor at once. That clash separates it from F♯7♭9, where the ninth is lowered, and from F♯9, where it is natural. Guitarists often call it the Hendrix chord.

Where F♯7♯9 is used

A dominant chord wants to resolve. Its home is the V of a major key - and the I of a blues, where the pull never lets up.

As the VB major
  1. ii7C♯m7
  2. V7♯9F♯7♯9
  3. Imaj7Bmaj7

F♯7♯9 is the chord that wants to resolve, so ending the loop on it hands straight back to the top.

Questions people ask

What notes are in the F♯7♯9 chord?
The F♯7♯9 chord contains F♯, A♯, C♯, E and G𝄪 (F#, A#, C#, E and G## in plain text).
Is the F♯7♯9 chord major or minor?
F♯7♯9 is a altered dominant seventh chord. Dominant seventh sharp nine chords sound gritty and bluesy at once, the clash of a major third against a sharp ninth that reads to the ear like a minor third. Funk, rock and soul horn sections lean hard on this one chord.
How do you play F♯7♯9 on piano?
Place your fingers on F♯, A♯, C♯, E and G𝄪 and play them together. The root usually goes to the little finger of the left hand, the upper notes to the right. On the keyboard F♯, A♯ and C♯ are black keys and E and G𝄪 are white. G𝄪 is the key you'd normally call A. The thumb starts on a black key, so slide the whole hand a little further in, towards the fallboard.
How do you play F♯7♯9 on guitar?
Use the fingering in the diagram above. The fretted notes sit between frets 1 and 2. String 1 rings open.
What is another name for the F♯7♯9 chord?
F♯7♯9 is enharmonically equivalent to G♭7♯9. Both chord names describe exactly the same notes, but the spelling depends on the key you are playing in.