To play the Gmin7b5 chord, perform a barre by pressing your index finger on the C-string, E-string, and bottom-A string on the 1st fret. Let the other string ring open.
The Gmin7(b5) chord is a minor-seventh-flat-five chord, also known as a half-diminished-seventh chord, and contains the notes G-Bb-Db-F.
To build a Gmin7(b5), take the minor seventh chord formula (1-b3-5-b7) and apply it to the G major scale (G, A, B, C, D, E, F#). 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 G major scale which are G-Bb-Db-F to form the Gmin7(b5) chord.
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