A9 guitar chords

A - C# - E - G - B

Chord Theory

A9 chords consist of the 1st, 3rd, 5th, b7th, 9th notes of a diatonic scale.
A Major Scale A - B - C# - D - E - F# - G#
Chart A9Guitar Chord
Chord A ninth - written as A9
Formula 1 - 3 - 5 - ♭7 - 9
Notes A - C# - E - G - B

A9 chord charts

Spelling: 1st(A), 3rd (C#), 5th(E), b7th(G), 9th(B)
1st 2nd 3rd
Righties:   A9  
    e|---|---|-2-|---|
    B|---|-1-|---|---|
    G|---|-1-|---|-3-|
    D|---|-1-|---|---|
    A|---|---|---|---|
    E|---|---|---|---|x
Frets  1   2   3   4

Written: x02423
Notes: x-A-E-B-C#-G  

Lefties:    A9 
     |---|-2-|---|---|e
     |---|---|-1-|---|B
     |-3-|---|-1-|---|G
     |---|---|-1-|---|D
     |---|---|---|---|A
    x|---|---|---|---|E
Frets  4   3   2   1
 TAB     e |-3-|
         B |-2-|
         G |-4-|
         D |-2-|
         A |-0-|
         E |---|
          A9
    e|---|-4-|---|
    B|---|-3-|---|
    G|-1-|---|---|
    D|---|-2-|---|
    A|---|---|---|
    E|---|---|---|x
Frets  4   5   6

Written: x05455
Notes: x-A-G-B-E-A

          A9
     |---|-4-|---|e
     |---|-3-|---|B
     |---|---|-1-|G
     |---|-2-|---|D
     |---|---|---|A
    x|---|---|---|E
Frets  6   5   4
 TAB     e |-5-|
         B |-5-|
         G |-4-|
         D |-5-|
         A |-0-|
         E |---|
          A9 
    e|---|---|-3-|
    B|-1-|---|---|
    G|-1-|-2-|---|
    D|-1-|---|---|
    A|---|---|---|
    E|---|---|---|x
Frets  5   6   7

Written: x05657
Notes: x-A-G-C#-E-B 

          A9 
     |-3-|---|---|e
     |---|---|-1-|B
     |---|-2-|-1-|G
     |---|---|-1-|D
     |---|---|---|A
    x|---|---|---|E
Frets  7   6   5 
 TAB     e |-7-|
         B |-5-|
         G |-6-|
         D |-5-|
         A |-0-|
         E |---|

Notes

  • This chord is a dominant 9th chord which is a dominant 7th chord with an added 9th. It is an extended chord which includes the dominant 7th in its structure.
  • If a chord with a symbol 9 is not preceded by the words major or maj, i.e., A9 as opposed to Amaj9, the 7th is always a dominant 7th (♭7).
  • A 9th chord implies the presence of the preceding 1st, 3rd, 5th, ♭7th, before the added 9th.
  • In the 2nd position chord, the 3rd is omitted... this is a particular voicing of the 9th chord where the third is omitted, and the 9th is played an octave lower... this could also be classed as a 7th suspended 2nd chord, in this case A7sus2. The chord formula is 1-2-5-♭7 = A-B-E-G (notes in the second position).
  • These chords are used mainly in jazz and alternate styles of music.
  • Standard keys using the A ninth chord: D major/B minor.
    Bm is the relative minor of D major which means both scales share the same notes. A9 (A - C# - E - G - B) utilizes notes belonging to the D Major & Bm Scale... D-E-F#-G-A-B-C#.
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