Chord and FretBb13 — dominant thirteenth
Also written A#13 — the same chord, spelled the other way.
Notes in Bb13: Bb – D – F – Ab – C – GFormula: 1 – 3 – 5 – b7 – 9 – 13In 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 13 is the full extended dominant. In practice, the third and seventh define the function while the thirteenth gives the color — the root and fifth can be omitted.
The same chord on all four instruments
Where to use it: An elegant dominant in jazz, MPB and gospel.
Every region of the neck hides more shapes of Bb13. In Chord and Fret, you check it note by note, playing any shape as an arpeggio; open every variation on the neck, grouped by bass note; and set a capo — the diagrams redraw above it. Start free. Unlock everything with Pro. Plays offline.
See the whole neck in Chord and Fret →Part of the Extended family.