Voicing of Half Diminished

Drop 2 IV

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Left hand
C3
Right hand
Eb4Bb4C5Gb5
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Drop 2

The Drop 2 IV voicing of Cm7b5 stacks Eb, Bb, C and Gb from the bottom up: the minor 3rd, minor 7th, root and flat 5th 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 Cm7b5 are Drop 2 I, Drop 2 II and Drop 2 III.