Ninth 9th Chord (Jazz Chord )

Introduction

Ninth chord is like seventh chord but in ninth chord,9^th note from chord scale is added.however, it still has 7^th with additional 9^th .So the chord parable as below,

 

Triad (major/minor)  +  7^th  +  9^th  = Maj/m9

There are three type of basic ninth chord.They are Dominant9,major9,& minor9.It easy to build 9 chord.Start from major or minor triad,add seventh,then add ninth into the chord.ninth notes is an octave higher than the tonic scale.It is an octave of 2^nd note in scale.Example in A minor & C major scale below.

Interval	1	2	3	4	5	6	7	8	9
Am	A	B	C	D	E	F	G	A	B
A	A	B	C#	D	E	F#	G#	A	B

How to Build 9^th chord

To build ninth chord,refer to formula below,use Am scale as example,

Dominant 9^th : 1 - 3 - 5 - b7 - 9

Major 7^th minor 9^th (Major 9) : 1 - 3 - 5 - 7 - 9

Minor 7^th  minor 9^th (Minor 9) : 1 - b3 - 5 - b7 – 9

To build A9 chord,use first formula above.add 7^th  note (from Am scale) & 9^th (from A major scale)to the triad major chord.A-C#-E.7^th note in A minor scale is G,while 9^th in A minor scale is B.So, the new A9 chord become A-C#-E-G-B

To build Amaj9 chord,use second formula above.same step in A9 building chord,but 7^th in Amaj9 is sharpen.7^th note come from major scale instead of A9 that use 7^th (from minor scale).Dominant 7 chord is combination of major triad with minor 7^th  discuss on last session of Dominant 7 chord .  7^th  note in Am scale is G# note,9^th note in Am scale is B note.So,new Amaj9 chord interval is : A-C#-E-G#-B.

To build Am9 chord,use third formula.Also add 7^th from Am scale and 9^th from Am scale to the triad.same step as previous 9 and maj9 chord.New Am9 chord interval is : A-C-E-G-B.

Table below show some  ninth chord was builed.

Dominant 9 Chord

Root	Major scale	Minor scale	Major chord	Dominant 7 chord	Dominant 9 chord
A	A,B,C#,D,E,F#,G#,A,B	A,B,C,D,E,F,G	A-C#-E	A-C#-E-G	A-C-E-G-B
B	B,C#,D#,E,F#,G#,A#,B,C	B,C#,D,E,F#,G,A	B-D#-F#	B-D#-F#-A	B-D#-F#-A-C
C	C,D,E,F,G,A,B,C,D	C,D,Eb,F,G,Ab,Bb	C-E-G	C-E-G-Bb	C-E-G-Bb-D
D	D,E,F#,G,A,B,C#,D,E	D,E,F,G,A,Bb,C	D-F#-A	D-F#-A-C	D-F#-A-C-E
E	E,F#,G#,A,B,C#,D#,E,F#	E,F#,G,A,B,C,D	E-G#-B	E-G#-B-D	E-G#-B-D-F#
F	F,G,A,Bb,C,D,E,F,G	F,G,Ab,Bb,C,Db,Eb	F-A-C	F-A-C-Eb	F-A-C-Eb-G
G	G,A,B,C,D,E,F#,G,A	G,A,Bb,C,D,Eb,F	G-B-D	G-B-G-F	G-B-G-F-A

Major 9 Chord

Root	Major Scale	Major chord	Maj7 chord	Maj9 chord
A	A,B,C#,D,E,F#,G#,A,B	A-C#-E	A-C#-E-G#	A-C#-E-G#-B
B	B,C#,D#,E,F#,G#,A#,B,C	B-D#-F#	B-D#-F#-A#	B-D#-F#-A#-C
C	C,D,E,F,G,A,B,C,D	C-E-G	C-E-G-B	C-E-G-B-D
D	D,E,F#,G,A,B,C#,D,E	D-F#-A	D-F#-A-C#	D-F#-A-C#-E
E	E,F#,G#,A,B,C#,D#,E,F#	E-G#-B	E-G#-B-D#	E-G#-B-D#-F#
F	F,G,A,Bb,C,D,E,F,G	F-A-C	F-A-C-E	F-A-C-E-G
G	G,A,B,C,D,E,F#,G,A	G-B-D	G-B-D-F#	G-B-D-F#-A

Minor 9 Chord

Root	Minor Scale	Minor chord	m7 chord	m9 chord
A	A,B,C,D,E,F,G,A,B	A-C-E	A-C-E-G	A-C-E-G-B
B	B,C#,D,E,F#,G,A,B,C#	B-D-F#	B-D-F#-A	B-D-F#-A-C#
C	C,D,Eb,F,G,Ab,Bb,C,D	C-Eb-G	C-Eb-G-Bb	C-Eb-G-Bb-D
D	D,E,F,G,A,Bb,C,D,E	D-F-A	D-F-A-C	D-F-A-C-E
E	E,F#,G,A,B,C,D,E,F#	E-G-B	E-G-B-D	E-G-B-D-F#
F	F,G,Ab,Bb,C,Db,Eb,F,G	F-Ab-C	F-Ab-C-Eb	F-Ab-C-Eb-G
G	G,A,Bb,C,D,Eb,F,G,A	G-Bb-D	G-Bb-D-F	G-Bb-D-F-A