To play the C#min7b5 chord, place the index finger on the 1st fret of the C-string and ring finger on the 2nd fret of the bottom A-string. Let the other strings ring open.
The C#min7(b5) or Dbmin7(b5) chord is a minor-seventh-flat-five chord, also known as a half-diminished-seventh chord, and contains the notes C#-E-G-B.
To build a C#min7(b5), take the minor seventh chord formula (1-b3-5-b7) and apply it to the C# major scale (C#, D#, E#, F#, G#, A#, B#). Flat the fifth scale degree to make the minor-seventh-flat-five formula 1-b3-b5-b7.
Identify the first, flat third, flat fifth, and flat seventh scale degrees in the C# major scale which are C#-E-G-B to form the C#min7(b5) chord.
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