Voicing of F# Diminished 7

Rooted Guide Tones I

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Left hand
F#3A3Eb4
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Rooted Guide Tones

The Rooted Guide Tones I voicing of F#dim7 stacks F#, A and Eb from the bottom up: the root, minor 3rd and diminished 7th of the chord.

It's one of the Rooted Guide Tones voicings: the root, 3rd and 7th in the left hand, as bebop pianists comped. The other for F#dim7 is Rooted Guide Tones II.