To play the A#maj7 chord, perform a barre by pressing your index finger on the E-string and bottom-A string on the 1st fret, middle finger on the 2nd fret of the top g-string, and ring finger on the 2nd fret of the C-string.
The Bbmaj7 chord (also known as an A#maj7 chord) contains the notes Bb-D-F-A.
To build a Bbmaj7 chord, take the major seventh chord formula (1-3-5-7) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A).
Identify the first, third, fifth, and seventh scale degrees in the Bb major scale, which are Bb-D-F-A, giving you a Bbmaj7 chord.
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