To play the Dbdim7 chord, place the index finger on the 1st fret of the C-string and middle finger on the 1st fret of the bottom A-string. Let the other strings ring open.
The C#dim7 chord, also known as the Dbdim7 chord, contains the notes C#-E-G-Bb.
To build a C#dim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the C# major scale (C#, D#, E#, F#, G#, A#, B#). 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 C# major scale which are C#-E-G-Bb.
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