The G-sharp half-diminished seventh chord (abbreviated "G#m7(b5) chord") is a four-note chord consisting of the notes G♯, B, D, and F♯. The chord is formed by lowering the fifth of a G-sharp minor seventh chord a half step.
G-sharp half-diminished seventh chord
G-sharp half-diminished chord G-sharp minor seventh flat five chord
G♯ B D F♯
1 ♭3 ♭5 ♭7
G♯ø G♯ø7 G♯m7b5 G♯–7(b5) G♯mi7(b5) G♯min7(b5)
Tetrad (four-note chord)