Chord & FretBb7(b9) — dominant flat ninth
Also written A#7(b9) — the same chord, spelled the other way.
Notes in Bb7(b9): Bb – D – F – Ab – CbFormula: 1 – 3 – 5 – b7 – b9In the formula, the numbers count steps of the major scale starting from the note that names the chord; "b" lowers a half step, "#" raises one — and a slash names the bass note.
The 7(b9) is a dramatic dominant. The minor ninth intensifies the resolution, especially when the target chord is minor.
The same chord on all four instruments
Where to use it: A dominant that resolves to a minor chord.
Every region of the neck hides more shapes of Bb7(b9). In Chord & Fret, you check it note by note, playing any shape as an arpeggio; compare positions with their difficulty marked; and change the tuning — the shape rewrites itself. Start free. Unlock everything with Pro. Plays offline.
See the whole neck in Chord & Fret →Part of the Altered dominants family.