Voicing of Bb Half Diminished

Rooted II

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Left hand
Fb3Ab3Bb3Db4
Family
4-Note Rooted

The Rooted II voicing of Bbm7b5 stacks Fb, Ab, Bb and Db from the bottom up: the flat 5th, minor 7th, root and minor 3rd 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 Bbm7b5 is Rooted I.