Guitar chords in the key of A# or Bb:
Chord Bb7 (3rd fret) v.2 notes: Bb, D, F, Bb, D and Ab.
This chord is played by placing a barre on fret three with your index finger.
Bb(A#) dominant 7th chord's alternative names: Bbdom7, (Bb septim).
1(A#/Bb), 3(D), 5(F), b7(G#/Ab).