Information about the A9 interval

Name

Augmented ninth

Abbreviation

A9

Chordname

Sharp nine
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Construct

How to build a Augmented ninth?

1.
A Augmented ninth uses 9 naturals.
Example: C3 D3 E3 F3 G3 A3 B3 C4 D4
2.
A Augmented ninth has 15 semitones between the notes.
Example: C3 C#3 D3 D#3 E3 F3 F#3 G3 G#3 A3 A#3 B3 C4 C#4 D4 D#4

Cheatsheet

Cb3 ↠ D4
C3 ↠ D#4
C#3 ↠ D##4
Db3 ↠ E4
D3 ↠ E#4
D#3 ↠ E##4
Eb3 ↠ F#4
E3 ↠ F##4
E#3 ↠ F###4
Fb3 ↠ G4
F3 ↠ G#4
F#3 ↠ G##4
Gb3 ↠ A4
G3 ↠ A#4
G#3 ↠ A##4
Ab3 ↠ B4
A3 ↠ B#4
A#3 ↠ B##4
Bb3 ↠ C#5
B3 ↠ C##5
B#3 ↠ C###5