To play the Ddim7 chord, place the index finger on the 1st fret of the top g-string, ring finger on the 2nd fret of the C-string, middle finger on the 1st fret of the E-string, and little finger on the 2nd fret of the bottom A-string.
The Ddim7 chord contains the notes D-F-Ab-B.
To build a Ddim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the D major scale (D, E, F#, G, A, B, C#). The "bb7" indicates a double flat seventh, meaning you lower the seventh scale degree two half steps.
Identify the first, flat third, flat fifth, and double flat seventh scale degrees in the D major scale which are D-F-Ab-B.
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