To play the Bbmin7 chord, perform a barre by pressing your index finger on the top g-string, C-string, E-string, and bottom-A string on the 1st fret.
The Bbmin7 chord, also known as an A#min7 chord, contains the notes Bb-Db-F-Ab.
To build a Bbmin7 chord, take the minor seventh formula (1-b3-5-b7) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A).
Identify the first, flat third, fifth, and flat seventh scale degrees in the Bb major scale, which are Bb-Db-F-Ab, giving you a Bbmin7 chord.
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