To play the Amin7b5 chord, perform a barre by pressing your middle finger on the C-string, E-string, and bottom-A string on the 3rd fret and index finger on the 2nd fret of the top g-string.
The Amin7(b5) chord is a minor-seventh-flat-five chord, also known as a half-diminished-seventh chord, and contains the notes A-C-Eb-G.
To build an Amin7(b5), take the minor seventh chord formula (1-b3-5-b7) and apply it to the A major scale (A, B, C#, D, E, F#, G#). 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 A major scale which are A-C-Eb-G to form the Amin7(b5) chord.
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