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- Left hand
- Fb3Bb3Db4
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- Triads
The 2nd Inversion voicing of Bbdim stacks Fb, Bb and Db from the bottom up: the flat 5th, root and minor 3rd of the chord.
It's one of the Triads voicings. The others for Bbdim are Root Inversion, 1st Inversion and Doubled Root.