Voicing of B Major 7

Drop 2 II

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Left hand
B2
Right hand
A#3D#4F#4B4
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Drop 2

The Drop 2 II voicing of Bmaj7 stacks A#, D#, F# and B from the bottom up: the major 7th, major 3rd, 5th and root 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 Bmaj7 are Drop 2 I, Drop 2 III and Drop 2 IV.