What is the G# Half-Diminished Chord?
Here's a fretboard view of the G# Half-Diminished chord so you can see where each chord tone lives across the neck. This chord is enharmonically equivalent to Ab Half-Diminished.
Notes and Arpeggios
The half-diminished chord (m7b5) combines a diminished triad with a minor 7th, and it's the classic "ii" chord in minor keys. It has a dark, yearning quality that sets up dominant-to-tonic resolutions beautifully. The complete chord tones are: G#, B, D, F#. The complete formula is 1, b3, b5, and b7.
How to Use It
This is especially common in blues and jazz, and it also shows up in funk and R&B comping. On bass, outline the harmony one note at a time. Start from the root and add the chord's actual degrees (b3, b5, and b7) as the arrangement allows. The chord-tone boxes locate notes; the ordered arpeggio gives a playable route with explicit position shifts.
Connect this chord to the next harmony using nearby chord tones. Shift the hand when the line needs it rather than stretching beyond a comfortable position. Use the highlights to spot where the same tone repeats across strings.