To play the Bmin7 chord, perform a barre by pressing your index finger on the top g-string, C-string, E-string, and bottom-A string on the 2nd fret.
The Bmin7 chord contains the notes B-D-F#-A.
To build a Bmin7 chord, take the minor seventh formula (1-b3-5-b7) and apply it to the B major scale (B, C#, D#, E, F#, G#, A#).
Identify the first, flat third, fifth, and flat seventh scale degrees in the B major scale, which are B-D-F#-A, giving you a Bmin7 chord.
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