G#dim Chord on Ukulele
G#dim = G# – B – D (Root, Minor 3rd, Tritone)
G#dim frets the G string at the first fret, the C string at the second, and the A string at the second, leaving the E string open, since open E is already one of the chord's own notes. The result is a diminished triad — root, minor third, and diminished fifth — built entirely from stacked minor-third intervals, with the open E string giving this particular voicing a bit more ring than a fully closed diminished shape would have.
G#dim has a specific, well-defined job in the key of A major — arguably the ukulele's second most common key after C or G: it's the vii° chord, built on the seventh scale degree, and diminished triads built on the leading tone are the classic passing chord used to connect a I chord to nearby harmony with maximum forward pull, since a diminished triad's inherent instability makes it want to resolve almost immediately. It shows up constantly as a brief passing chord between A and Bm, or between A and A's own first inversion, adding a moment of tension a plain major or minor chord can't supply — the same functional role F#dim plays for G major elsewhere in this site, just one key over. Because the open E string keeps ringing throughout, G#dim doesn't sound as harsh as its harmonic instability might suggest; it reads as unsettled rather than jarring, which is exactly the quality that makes it useful as a connector.
Fingerings
Open Position
How to Practice It
The C and A strings share the same second fret but aren't adjacent, so this is a two-finger placement, not a barre — keep the middle and ring fingers independent and make sure the open E string ringing between them isn't muted by either. Because G#dim is almost always a passing chord, practice it in motion rather than as a held chord: try A to G#dim to Bm, or A to G#dim back to A's first inversion, focusing on how quickly the hand can drop into and out of the shape. It's also worth knowing that diminished triads repeat every minor third, so this exact shape, moved up three frets, produces a different diminished chord with an overlapping set of notes.
Common Progressions
- I – vii° – I6, a classic passing move within A major (A – G#dim – A/C#)
- vii° – i, resolving G#dim into A minor for a modal-interchange color
- vi – vii° – I, using G#dim as a connector into an A major cadence (F#m – G#dim – A)
- G#dim as a chromatic passing chord between A and Bm
FAQ
- What key does G#dim naturally belong to?
- A major — G# is that key's seventh scale degree, and the diminished triad built on it (vii°) is the classic passing chord used to connect A to nearby harmony with strong forward pull.
- Why does G#dim leave the E string open?
- The open E string's natural pitch is already one of the chord's three notes, so it can ring for free while the G, C, and A strings handle the rest of the shape.
- Is G#dim ever used as a chord to linger on?
- Rarely — diminished triads are inherently unstable and are almost always used as brief passing or connecting chords rather than places a progression settles.
- Does the G#dim shape work for other diminished chords?
- Yes — because diminished chords repeat every three frets (a minor third), sliding this same shape up or down by three-fret increments produces other diminished chords sharing an overlapping set of notes.
G#dim on other instruments: G#dim on Guitar, G#dim on Piano. Related: how chords are built, chord finder.