Voicing of F# Half Diminished

Drop 2 I

Back to F#m7b5

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Left hand
F#2
Right hand
C4F#4A4E5
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Drop 2

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