Voicing of D Major Triad

2nd Inversion

Back to D

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Left hand
A2D3F#3
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Triads

The 2nd Inversion voicing of D stacks A, D and F# from the bottom up: the 5th, root and major 3rd of the chord.

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