Voicing of Dominant 7

Rooted I

Back to C7

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Left hand
C3E3G3Bb3
Family
4-Note Rooted

The Rooted I voicing of C7 stacks C, E, G and Bb from the bottom up: the root, major 3rd, 5th and minor 7th of the chord.

It's one of the 4-Note Rooted voicings: four-note voicings with the root on the bottom or inside, in the left hand. The other for C7 is Rooted II.