Chord and FretBb(b5) — major flat five
Also written A#(b5) — the same chord, spelled the other way.
Notes in Bb(b5): Bb – D – FbFormula: 1 – 3 – b5In 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.
It keeps the major third and lowers only the fifth by a semitone. It is the major triad seen through cracked glass: still recognisable, but something is out of true.
The same chord on all four instruments
Where to use it: A rare, modern colour; in practice it shows up far more with the seventh attached, as C7(b5), than on its own.
Every region of the neck hides more shapes of Bb(b5). In Chord and 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 and Fret →Part of the Triads family.