Information about the A11 interval

Name

Augmented undecime

Abbreviation

A11

Chordname

Sharp eleventh
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Construct

How to build a Augmented undecime?

1.
A Augmented undecime uses 11 naturals.
Example: C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4
2.
A Augmented undecime has 18 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 E4 F4 F#4

Cheatsheet

Cb3 ↠ F4
C3 ↠ F#4
C#3 ↠ F##4
Db3 ↠ G4
D3 ↠ G#4
D#3 ↠ G##4
Eb3 ↠ A4
E3 ↠ A#4
E#3 ↠ A##4
Fb3 ↠ Bb4
F3 ↠ B4
F#3 ↠ B#4
Gb3 ↠ C5
G3 ↠ C#5
G#3 ↠ C##5
Ab3 ↠ D5
A3 ↠ D#5
A#3 ↠ D##5
Bb3 ↠ E5
B3 ↠ E#5
B#3 ↠ E##5