The A♯ Minor 11th chord (A♯m11) contains the notes A♯, C♯, E♯, G♯, B♯, and D♯. Its interval formula is R-m3-P5-m7-M9-P11. A minor 9th plus the 11th — rich and modern, common in jazz fusion and contemporary R&B.
=B♭ Minor 11th›
This is the same chord as B♭ Minor 11th — the same keys on the keyboard, spelled with flats.
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A♯m11
The A♯ Minor 11th chord is a six-note chord made up of A♯, C♯, E♯, G♯, B♯, and D♯. It is built from a root, minor third, perfect fifth, minor seventh, major ninth, and perfect eleventh.
Construction
A♯ Minor 11th = Root + Minor 3rd + Perfect 5th + Minor 7th + Major 2nd + Perfect 4th = A♯ · C♯ · E♯ · G♯ · B♯ · D♯
Note
Interval
Degree
A♯
Root
1
C♯
Minor 3rd
♭3
E♯
Perfect 5th
5
G♯
Minor 7th
♭7
B♯
Major 2nd
9
D♯
Perfect 4th
11
Key Signature
A chord has no key signature of its own, but the A♯ Minor 11th is the tonic (i) chord of A# Minor, which shares the signature of its relative major, C# Major — 7 sharps (F♯, C♯, G♯, D♯, A♯, E♯, B♯).
F♯C♯G♯D♯A♯E♯B♯
Order of sharps
Sharps are added to a key signature in a fixed order. Each new sharp key adds the next sharp on the list.
F♯C♯G♯D♯A♯E♯B♯
Mnemonic:Father Charles Goes Down And Ends Battle
Chords in the Key of A♯ Minor
These are the triads built on each degree of the A♯ minor scale:
The notes A♯ – C♯ – E♯ – G♯ – B♯ – D♯ aren’t exclusive to this chord. Depending on which note is the bass and how the chord functions, the same pitches also spell:
Keep going with the Minor 11th chord — these pages cover the underlying theory, the connected reference material, and the practice tools that work with this chord.
The note names, intervals, fingering, and harmony on this chord page are grounded in the following sources. Public domain treatises and scores are linked to their full text; primary data is piano.org's own interval-derived reference dataset — continuously maintained and human-verified, with no fixed publication date.