The G-sharp dominant seventh flat five chord (abbreviated "G#7(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 dominant seventh chord a half step.
G-sharp dominant seventh flat five chord
G♯ B♯ D F♯
1 3 ♭5 ♭7
Tetrad (four-note chord)