Voicing of Gb Dominant b5

Rooted Guide Tones I

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Left hand
Gb3Bb3Fb4
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Gb7b5 stacks Gb, Bb and Fb from the bottom up: the root, major 3rd 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 Gb7b5 is Rooted Guide Tones II.