Voicing of C# Half Diminished

Drop 2 III

Back to C#m7b5

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Left hand
C#2
Right hand
C#4G4B4E5
Family
Drop 2

The Drop 2 III voicing of C#m7b5 stacks C#, G, B and E from the bottom up: the root, flat 5th, minor 7th and minor 3rd of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for C#m7b5 are Drop 2 I, Drop 2 II and Drop 2 IV.