G-sharp Half-Diminished 7th Chord

How to play the G-sharp Half-Diminished 7th Chord on the piano

Let’s go through some charts that will familiarize you with the G-sharp Half-Diminished 7th Chord and how to play it in the various forms you will encounter in pieces of music. First, we’ll look at the fundamental chord and its inversions; then, we’ll explore some more complex voicings.

The G-sharp Half-Diminished 7th Chord in root position

In root position, the notes of the G♯ half-diminished 7th chord are stacked in thirds with G♯ on the bottom. The appearance on the staff is evenly spaced, as is the feeling of the space in between your fingers while playing.

G-sharp Half-Diminished 7th Chord in root position
Note Order	G♯ B D F♯
Left Hand Fingering	5 3 2 1
Right Hand Fingering	1 2 3 5
Chord Symbol	G♯m7♭5 or G♯^ø7

The G-sharp Half-Diminished 7th Chord in first inversion

In first inversion, the third of the chord (B) becomes the bottom note, and the root (G♯) jumps up to the top.

G-sharp Half-Diminished 7th Chord in 1^st inversion
Note Order	B D F♯ G♯
Left Hand Fingering	5 3 2 1
Right Hand Fingering	1 2 4 5
Chord Symbol	G♯^ø6/5 or G♯m7♭5/B

The G-sharp Half-Diminished 7th Chord in second inversion

In second inversion, the fifth of the chord (D) is on the bottom, and the third of the chord (B) goes to the top.

G-sharp Half-Diminished 7th Chord in 2^nd inversion
Note Order	D F♯ G♯ B
Left Hand Fingering	5 3 2 1
Right Hand Fingering	1 2 3 5
Chord Symbol	G♯^ø4/3 or G♯m7♭5/D

The G-sharp Half-Diminished 7th Chord in third inversion

In third inversion, the seventh of the chord (F♯) is on the bottom, and the fifth of the chord (D) goes to the top.

G-sharp Half-Diminished 7th Chord in 3^rd inversion
Note Order	F♯ G♯ B D
Left Hand Fingering	5 4 2 1
Right Hand Fingering	1 2 3 5
Chord Symbol	G♯^ø4/2 or G♯m7♭5/F♯

G-sharp Half-Diminished 7th Chord theory and function

The half-diminished 7th is a diminished triad with a minor seventh, and it is a softer kind of tension than the fully diminished chord. It is the ii chord of minor keys and the vii chord of major keys, and it usually leads to a dominant.

The G♯ half-diminished 7th chord is the leading-tone chord (viiø7) in A major. In minor keys, it is the supertonic (iiø7) in F♯ minor. On the keyboard this is the same chord as A♭ half-diminished 7th, a spelling none of the common keys uses.

The pattern to know is ii – V – i in a minor key. In F♯ minor that is G♯ø7 – C♯7 – F♯m. The notes are also a minor 6th chord in inversion: G♯ø7 contains the same four notes as Bm6, which is why theory books sometimes describe it as a minor triad with an added sixth. Try playing G♯ø7 and then G♯°7: the two chords differ by a single note, and it is worth hearing how much that one half step changes.