I-IV-V foundation
This is the core major-key movement behind blues, rock, country, and pop progressions.
Guitar chord companion
A Add 9 Chord
Learn the A Add 9 chord on guitar with chord tones, intervals, and interactive fretboard shapes.
1A3C#5E9B
Playable A Add 9 Chord voicings
Start with these chord-box shapes, then use the full fretboard below to see every chord tone.
A shape, open position
Low to high strings: x 0 2 4 2 0
G shape, fret 2
Low to high strings: 5 2 2 2 2 5
E shape, fret 5
Low to high strings: 5 7 x 6 x 7
D shape, fret 7
Low to high strings: 9 x 7 9 10 7
C shape, fret 9
Low to high strings: x 12 11 9 12 9
Full fretboard map
Every A Add 9 Chord chord tone across the neck, with roots highlighted for quick orientation.
Frets 0–24. Select a position or tap a note to hear it.
CAGED
Progression examples using A Add 9
Try these progressions to hear the harmony in context. On bass, outline each chord with individual target tones.
I-vi-IV-V loop
A familiar pop progression that balances a stable tonic with relative minor color.
Chord Tones
| Degree | Interval | Note |
|---|---|---|
| 1 | Root | A |
| 3 | M3 | C# |
| 5 | P5 | E |
| 9 | M9 | B |
Scales Containing the Complete Formula
Complete Formula
1 – 3 – 5 – 9
Compound degrees retain their names: 9, 11, and 13 are extensions. A voicing may place their pitches in a closer register.