Voicing of C# Half Diminished

Drop 2 II

Back to C#m7b5

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Left hand
C#2
Right hand
B3E4G4C#5
Family
Drop 2

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