Voicing of F# Diminished 7

Drop 2 IV

Back to F#dim7

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Left hand
F#2
Right hand
A3Eb4F#4C5
Family
Drop 2

The Drop 2 IV voicing of F#dim7 stacks A, Eb, F# and C from the bottom up: the minor 3rd, diminished 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#dim7 are Drop 2 I, Drop 2 II and Drop 2 III.