Voicing of Gb Minor 11

Rooted Guide Tones I

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Left hand
Gb3Bbb3Fb4
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Gbm11 stacks Gb, Bbb and Fb from the bottom up: the root, minor 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 Gbm11 is Rooted Guide Tones II.