Voicing of F Minor Triad

2nd Inversion

Back to Fm

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Left hand
C3F3Ab3
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Triads

The 2nd Inversion voicing of Fm stacks C, F and Ab from the bottom up: the 5th, root and minor 3rd of the chord.

It's one of the Triads voicings. The others for Fm are Root Inversion, 1st Inversion and Doubled Root.