Voicing of Major 9

Rooted Guide Tones I

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Left hand
C3E3B3
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Rooted Guide Tones

The Rooted Guide Tones I voicing of Cmaj9 stacks C, E and B from the bottom up: the root, major 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 Cmaj9 is Rooted Guide Tones II.