To play the A#sus chord, perform a barre by pressing your index finger on the E-string and bottom-A string on the 1st fret, ring finger on the 3rd fret of the top g-string, and little finger on the 3rd fret of the C-string.
The Bbsus chord contains the notes Bb-Eb-F.
In this case, the "sus" in the chord name, which means suspended is referring to a "sus4" note.
To build a Bbsus chord, take the suspended fourth chord formula (1-4-5) and apply it to the Bb major scale (Bb, C, D, Eb, F, G, A).
Identify the first, fourth, and fifth scale degrees in the Bb major scale which are Bb-Eb-F, which gives you a Bbsus chord.
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