Voicing of C# Diminished 7

Guide Tones I

Back to C#dim7

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Left hand
C#2
Right hand
E4Bb4
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Guide Tones

The Guide Tones I voicing of C#dim7 stacks E and Bb from the bottom up: the minor 3rd and diminished 7th of the chord. It leaves out the root, C#, for the left hand or the bass player to take.

It's one of the Guide Tones voicings: just the 3rd and 7th, the notes that define each chord, played over the root. The other for C#dim7 is Guide Tones II.