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Information about the augmented ninth interval

Name

This is the augmented ninth interval.

Abbreviation

This interval is abbreviated with A9.

Practice the A9 interval

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Construct

How to construct the augmented ninth interval?

To construct an interval correctly you must always use two steps.

1 • Count the amount of naturals used
2 • Count the semitone steps between the two notes

At first, and with easy intervals, this may seem unnecessary, but when advancing to more difficult intervals and musical keys they will become more mandatory.

The following example is for a minor second from C3. Outcome: D4

1 • The augmented ninth spans 9 naturals.
C3  ↠  D3  ↠  E3  ↠  F3  ↠  G3  ↠  A3  ↠  B3  ↠  C4  ↠  D4
2 • The augmented ninth has 15 semitones between the notes.
C3  ↠  C3  ↠  D3  ↠  D3  ↠  E3  ↠  F3  ↠  F3  ↠  G3  ↠  G3  ↠  A3  ↠  A3  ↠  B3  ↠  C4  ↠  C4  ↠  D4  ↠  D4

Cheatsheet

The augmented ninth transposed from each note

C
D
C
D
C
D
D
E
D
E
D
E
E
F
E
F
E
F#
F
G
F
G
F
G
G
A
G
A
G
A
A
B
A
B
A
B
B
C
B
C
B
C#

Practice the augmented ninth interval

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Chords

Which chords use the augmented ninth interval?

Scales

Which scales use the augmented ninth interval?

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