To play the Gdim chord, place the index finger on the 1st fret of the C-string, little finger on the 3rd fret of the E-string, and middle finger on the 1st fret of the bottom A-string. Let the other string ring open.
The Gdim chord contains the notes G-Bb-Db.
To build a Gdim chord, take the diminished triad formula (1-b3-b5) and apply it to the G major scale (G, A, B, C, D, E, F#).
Identify the first, third, and fifth scale degrees in a G major scale which are G-B-D.
Lower the third and fifth scale degrees a half step in accordance with the diminished triad formula, which results in the notes G-Bb-Db for the Gdim chord.
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