Voicing of B Dominant b5

Drop 2 I

Back to B7b5

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Left hand
B2
Right hand
F3B3D#4A4
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Drop 2

The Drop 2 I voicing of B7b5 stacks F, B, D# and A from the bottom up: the flat 5th, root, major 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 B7b5 are Drop 2 II, Drop 2 III and Drop 2 IV.