Voicing of A# Diminished 7

Rooted Guide Tones II

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Left hand
A#2G3C#4
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Rooted Guide Tones

The Rooted Guide Tones II voicing of A#dim7 stacks A#, G and C# from the bottom up: the root, diminished 7th and minor 3rd 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 A#dim7 is Rooted Guide Tones I.