To play the Adim7 chord, place the index finger on the 2nd fret of the top g-string, ring finger on the 3rd fret of the C-string, middle finger on the 2nd fret of the E-string, and little finger on the 3rd fret of the bottom A-string.
The Adim7 chord contains the notes A-C-Eb-Gb.
To build a Adim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the A major scale (A, B, C#, D, E, F#, G#).
Identify the first, third, fifth, and seventh scale degrees in a A major scale which are A-C#-E-G#.
Lower the third and fifth scale degrees a half step and the seventh scale degree two half steps (as indicated by the "bb" or "double flat") in accordance with the diminished seventh chord formula, which results in the notes A-C-Eb-Gb for the Adim7 chord.
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