Notes in A11
The A11 chord contains 6 notes: A, C♯, E, G, B, D
Intervals
| Interval | Semitones | Note | Function |
|---|---|---|---|
| R | 0 | A | Root |
| 3 | 4 | C♯ | Major 3rd |
| 5 | 7 | E | Perfect 5th |
| ♭7 | 10 | G | Minor 7th |
| 9 | 2 | B | Major 9th |
| 11 | 5 | D | Perfect 11th |
About A Dominant 11th Chords
Dominant 11th chords extend the 9th with an 11th (4th up an octave). In practice, guitarists often omit the 3rd to avoid a half-step clash with the 11th. The result is sometimes indistinguishable from a 7sus4 voicing.
Compatible Scales & Modes
These scales contain all the notes of A11 and can be used for soloing, improvising, and writing melodies over this chord.
EXPLORE MODES
Playing A eleventh on Guitar
The A eleventh chord, spelled A, C♯, E, G, B, D, occupies a specific harmonic role that depends on the musical context. In the key of A major and A minor, this chord can function as a primary harmony or as a passing color depending on where it appears in the progression. Understanding which scale degrees produce A-rooted chords helps you predict chord progressions and improvise melodies that complement the harmony.
On guitar, A eleventh voicings benefit from the open A string providing a strong bass note. The physical shape of this chord on the fretboard determines its tonal character — the same notes arranged in different voicings produce noticeably different sounds due to string gauge, fret position, and overtone content. Experiment with playing A eleventh in multiple positions to find the voicing that best fits the register and texture of the music you are working on.
A11 pushes harmony to its upper extensions, creating a dense, complex sound. On guitar, full A11 voicings require omitting some notes — the third and fifth are typically dropped in favor of the root, seventh, ninth, and eleventh for a more open, usable shape.
When practicing A eleventh, use the compatible scales listed above to improvise melodies and riffs. Start by playing the chord, then explore the scale tones one at a time to hear how each note sounds against the harmony. This ear training exercise connects your theoretical knowledge of A-rooted chords to practical musicianship skills that improve your playing across all genres and styles.