To play the Gbmin7b5 chord, perform a barre by pressing your index finger on the top g-string and E-string on the 2nd fret, ring finger on the 4th fret of the C-string, and middle finger on the 3rd fret of the bottom A-string.
The F#min7(b5) or Gbmin7(b5) chord is a minor-seventh-flat-five chord, also known as a half-diminished-seventh chord, and contains the notes F#-A-C-E.
To build an F#min7(b5), take the minor seventh chord formula (1-b3-5-b7) and apply it to the F# major scale (F#, G#, A#, B, C#, D#, E#). Flat the fifth scale degree to make the minor-seventh-flat-five formula 1-b3-b5-b7.
Identify the first, flat third, flat fifth, and flat seventh scale degrees in the F# major scale which are F#-A-C-E to form the F#min7(b5) chord.
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