To play the Fdim7 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 Fdim7 chord contains the notes F-Ab-Cb-D.
To build an Fdim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the F major scale (F, G, A, Bb, C, D, E). 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 F major scale which are F-Ab-Cb-D. In this case, Cb is the enharmonic equivalent of a B note.
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