Chord & FretA9 — dominant ninth
Notes in A9: A – C# – E – G – BFormula: 1 – 3 – 5 – b7 – 9In 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 9 is the dominant chord with the ninth. It keeps the dominant function and adds color and breadth.
The same chord on all four instruments
Where to use it: Blues, funk, choro and broader dominants.
Every region of the neck hides more shapes of A9. In Chord & Fret, you hear every shape strummed string by string, in each instrument's own voice; compare positions with their difficulty marked; and set a capo — the diagrams redraw above it. Start free. Unlock everything with Pro. Plays offline.
See the whole neck in Chord & Fret →Part of the Extended family.