Guitar chords in the key of A# or Bb:
Chord Bb6/9 notes: Bb, D, G, C and F. You should not play the 6th string.
The guitar strings 4(D) and 3(G) are left open.
Bb(A#) major 6/9 guitar chord's alternative names: Bb6add9, Bbadd6/9.
1(A#/Bb), 3(D), 5(F), 6(G), 9(C).