A9 guitar chords

A - C# - E - G - B

The Theory

A ninth chords are generally written as A9
A Major Scale A - B - C# - D - E - F# - G#
Key Signature A Major Scale - Key Signature
Chord A9
Chord Formula 1 - 3 - 5 - ♭7 - 9
Notes A - C# - E - G - B

The Charts

A9 Guitar Chords

A9 Chords
Position 1st 2nd 3rd
Written Chord x02423 x05455 x05657
Chord Notes x-A-E-B-C#-G x-A-G-B-E-A x-A-G-C#-E-B
Chord Tabs
e |-3-|
B |-2-|
G |-4-|
D |-2-|
A |-0-|
E |---|
e |-5-|
B |-5-|
G |-4-|
D |-5-|
A |-0-|
E |---|
e |-7-|
B |-5-|
G |-6-|
D |-5-|
A |-0-|
E |---|


  • 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).
  • A ninth chords: 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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