Voicing of Bb Dominant b5

Rooted I

Back to Bb7b5

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Left hand
Bb2D3Fb3Ab3
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4-Note Rooted

The Rooted I voicing of Bb7b5 stacks Bb, D, Fb and Ab from the bottom up: the root, major 3rd, flat 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 Bb7b5 is Rooted II.