To play the A#6 chord, perform a barre by pressing your index finger on the E-string and bottom-A string on the 1st fret and middle finger on the 2nd fret of the C-string. Let the other string ring open.
The Bb6 chord (also known as the A#6 chord) contains the notes Bb-D-F-G.
To build a Bb6 chord, take the added sixth chord formula (1-3-5-6) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A).
Identify the first, third, fifth, and sixth scale degrees in the Bb major scale, which are Bb-D-F-G, giving you a Bb6 chord.
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