Voicing of F Dominant b5

Drop 2 IV

Back to F7b5

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Left hand
F2
Right hand
A3Eb4F4Cb5
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Drop 2

The Drop 2 IV voicing of F7b5 stacks A, Eb, F and Cb from the bottom up: the major 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 F7b5 are Drop 2 I, Drop 2 II and Drop 2 III.