Voicing of G Diminished 7

Drop 2 I

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Left hand
G2
Right hand
Db4G4Bb4Fb5
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Drop 2

The Drop 2 I voicing of Gdim7 stacks Db, G, Bb and Fb from the bottom up: the flat 5th, root, minor 3rd and diminished 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 Gdim7 are Drop 2 II, Drop 2 III and Drop 2 IV.