Voicing of Bb Dominant 7 sus4 b9

Rooted Guide Tones I

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Left hand
Bb2Eb3Ab3
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Bb7susb9 stacks Bb, Eb and Ab 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 Bb7susb9 is Rooted Guide Tones II.