Voicing of A Minor-Major 7

Rooted Guide Tones I

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Left hand
A2C3G#3
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Am(maj7) stacks A, C and G# from the bottom up: the root, minor 3rd and major 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 Am(maj7) is Rooted Guide Tones II.