Voicing of Ab Dominant 7

Rooted Guide Tones II

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Left hand
Ab2Gb3C4
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Rooted Guide Tones

The Rooted Guide Tones II voicing of Ab7 stacks Ab, Gb and C from the bottom up: the root, minor 7th and major 3rd 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 Ab7 is Rooted Guide Tones I.