Voicing of Bb Major 7

Drop 2 III

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Left hand
Bb2
Right hand
Bb3F4A4D5
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Drop 2

The Drop 2 III voicing of Bbmaj7 stacks Bb, F, A and D from the bottom up: the root, 5th, major 7th and major 3rd of the chord.

It's one of the Drop 2 voicings: four-note chords in close position with the second note from the top dropped an octave, played over the root. The others for Bbmaj7 are Drop 2 I, Drop 2 II and Drop 2 IV.