To play the Bmaj7 chord, perform a barre by pressing your index finger on the E-string and bottom-A string on the 2nd fret, middle finger on the 3rd fret of the top g-string, and ring finger on the 3rd fret of the C-string.
The Bmaj7 chord contains the notes B-D#-F#-A#.
To build a Bmaj7 chord, take the major seventh chord formula (1-3-5-7) and apply it to the B major scale (B, C#, D#, E, F#, G#, A#).
Identify the first, third, fifth, and seventh scale degrees in the B major scale, which are B-D#-F#-A#, giving you a Bmaj7 chord.
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