Arpeggio · A△9 · Piano
The A△9 arpeggio is A – C♯ – E – G♯ – B — chord tones 1 3 5 7 9. A△9 is a lush tonic chord in ballads; its sound is wide, luminous. Below, every A, C♯, E, G♯, B on the two-octave keyboard is marked, with the root in gold. Press play to hear a one-octave arpeggio, or tap any note.
Visualizer
Piano
Guitar · standard tuning
Play runs the arpeggio up and down one octave. Tap any marked note to hear it. “Show” switches or combines the fretboard and keyboard; “Sound” picks the instrument you hear. Audio is synthesized in the browser.
Reference
| Chord tone | Note | Interval from A |
|---|---|---|
| 1 | A | unison (0 semitones) |
| 3 | C♯ | major 3rd (4 semitones) |
| 5 | E | perfect 5th (7 semitones) |
| 7 | G♯ | major 7th (11 semitones) |
| 9 | B | major 2nd + octave (14 semitones) |
Goes with: A Major (Ionian) (A B C♯ D E F♯ G♯). Voicings: see the four-note chord voicings in the chord library.
Common questions
A – C♯ – E – G♯ – B. As chord tones: 1 3 5 7 9. Played one after another instead of together, that is the arpeggio.
A△9 is a lush tonic chord in ballads. Its character is wide, luminous.
A Major (A B C♯ D E F♯ G♯) — the arpeggio is the skeleton of that scale, so practise them together.
Play A – C♯ – E – G♯ – B ascending from A, then descend; then start from each chord tone in turn (inversions) so your hand knows the shape from any note.
Keep going
Same arpeggio on guitar · Major 9th hub · chord-scale theory.
Other arpeggios from A