Voicing of A Major 6

Rooted Guide Tones I

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Left hand
A2C#3F#3
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Rooted Guide Tones

The Rooted Guide Tones I voicing of A6 stacks A, C# and F# from the bottom up: the root, major 3rd and 6th 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 A6 is Rooted Guide Tones II.