Voicing of F# Dominant b5

Drop 2 IV

Back to F#7b5

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Left hand
F#2
Right hand
A#3E4F#4C5
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Drop 2

The Drop 2 IV voicing of F#7b5 stacks A#, E, F# and C 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 F#7b5 are Drop 2 I, Drop 2 II and Drop 2 III.