Voicing of Db Dominant 9 sus4

Rooted Guide Tones I

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Left hand
Db3Gb3Cb4
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Db9sus4 stacks Db, Gb and Cb from the bottom up: the root, 4th and minor 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 Db9sus4 is Rooted Guide Tones II.