A Major Ninth Chord
Also known as:
A Major 9th , AM9 , Amaj9 , AMaj9 , Ama9 , AΔ9
The A Major Ninth Chord has a Major quality which includes a Major Third interval that produces a generally happy sound. A Major Ninth Chord contains the notes A, C♯, E, G♯, B. The A Major Ninth Chord is an Extended type chord which means it includes a Triad (the Root A, the Third C♯, and the Fifth E), the Seventh G♯, and also includes the Ninth (Second) B from the octave above.
Below you will find the A Major Ninth Chord notes, notation, degrees, intervals, related scales and chords, and more.
Notes
A, C♯, E, G♯, B
Can be omitted: E
Notation
Degrees
| Note | Number | Name |
|---|---|---|
| A | 1 | Tonic |
| C♯ | 3 | Mediant |
| E | 5 | Dominant |
| G♯ | 7 | Leading Tone |
| B | 9 | Supertonic |
Intervals
| Notes | Semitones | Interval |
|---|---|---|
| A > A | 0 | Perfect Unison (P1) |
| A > C♯ | 4 | Major 3rd (M3) |
| A > E | 7 | Perfect 5th (P5) |
| A > G♯ | 11 | Major 7th (M7) |
| A > B | 14 | Major 9th (M9) |
Scales related to A Major Ninth Chord
Same Spellings
Scales that include all of the notes of the A Major Ninth Chord.
I Chord of A Major Scale
IV Chord of E Major Scale
♭VI Chord of C♯ Natural Minor Scale
♭III Chord of F♯ Natural Minor Scale
I Chord of A Ionian Mode
IV Chord of E Ionian Mode
♭VII Chord of B Dorian Mode
♭III Chord of F♯ Dorian Mode
♭VI Chord of C♯ Phrygian Mode
♭II Chord of G♯ Phrygian Mode
I Chord of A Lydian Mode
V Chord of D Lydian Mode
♭VII Chord of B Mixolydian Mode
IV Chord of E Mixolydian Mode
♭VI Chord of C♯ Aeolian Mode
♭III Chord of F♯ Aeolian Mode
♭V Chord of D♯ Locrian Mode
♭II Chord of G♯ Locrian Mode
Different Spellings
Scales that include different spellings of all the notes of the A Major Ninth Chord.
IV Chord of F♭ Major Scale
♭VI Chord of D♭ Natural Minor Scale
♭III Chord of G♭ Natural Minor Scale
IV Chord of F♭ Ionian Mode
♭VII Chord of C♭ Dorian Mode
♭III Chord of G♭ Dorian Mode
♭VI Chord of D♭ Phrygian Mode
♭II Chord of A♭ Phrygian Mode
♭VII Chord of C♭ Mixolydian Mode
IV Chord of F♭ Mixolydian Mode
♭VI Chord of D♭ Aeolian Mode
♭III Chord of G♭ Aeolian Mode
♭V Chord of E♭ Locrian Mode
♭II Chord of A♭ Locrian Mode
Chords related to A Major Ninth Chord
Same Notes
Chords that have all of the same notes (in any spelling) as the A Major Ninth Chord.
No matches found
Same Root Note
Chords that include the same notes (in any spelling) as the A Major Ninth Chord and have the same root note.
A Major Eleventh Chord
A Major Thirteenth Chord
A Major Seventh Sharp Eleventh Chord
Different Root Note
Chords that include the same notes (in any spelling) as the A Major Ninth Chord but have a different root note.
E Major Thirteenth Chord
F♭ Major Thirteenth Chord
F♯ Minor Eleventh Chord
G♭ Minor Eleventh Chord
B Minor Thirteenth Chord
C♭ Minor Thirteenth Chord
F♯ Minor Thirteenth Chord
G♭ Minor Thirteenth Chord
B Dominant Thirteenth Chord
C♭ Dominant Thirteenth Chord
E Dominant Thirteenth Chord
F♭ Dominant Thirteenth Chord
If you want to learn what chords are and much more, check out our free Fundamentals of Music Theory course. If you already know some of the basics, you can jump straight into the chords lesson.
