Guitar chords in the key of A# or Bb:
Chord Bbsus4 (3rd fret) notes: F, Bb, Eb and Bb. You must leave out the 6th and 5th strings.
Bb(A#) suspended 4th chord's alternative names: Bbsus, Bbsus4.
1(A#/Bb), 4(D#/Eb), 5(F).