Voicing of Gb Suspended 4

2nd Inversion

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Left hand
Db3Gb3Cb4
Family
Triads

The 2nd Inversion voicing of Gbsus4 stacks Db, Gb and Cb from the bottom up: the 5th, root and 4th of the chord.

It's one of the Triads voicings. The others for Gbsus4 are Root Inversion, 1st Inversion and Doubled Root.