A9 chord on piano
A dominant 9th: A · C♯ · E · G · B. It sounds the funk and soul workhorse: a dominant 7th wearing colour.
NotesA C♯ E G B
Built fromroot + major 3rd + perfect 5th + minor 7th + major 9th
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On the keyboard
Fingering
Right hand, root position: A — finger 1 · C♯ — finger 2 · E — finger 3 · G — finger 4 · B — finger 5. (1 = thumb, 5 = little finger.)
Inversions
The same notes in a different order. Inversions are how players move between chords without jumping:
- RootA – C♯ – E – G – B
- 1stC♯ – E – G – B – A
- 2ndE – G – B – A – C♯
- 3rdG – B – A – C♯ – E
- 4rdB – A – C♯ – E – G