A# minor
Minor key. Scale: A#, B#, C#, D#, E#, F#, G#.
Octaves
Musical context
How the key relates to the chord, scale, mode and progression.
Theory
General info
- Name
- A# minor
- Mode
- Minor
- Tonic
- A#
- Key signature
7 sharps: A, B, C, D, E, F, G.
- Key character
- Scale degree 3 clearly distinguishes minor from the parallel major, while variable degrees 6 and 7 make voice leading flexible. In equal temperament, tonic pitch alone does not determine mood; melody, harmony, register, tempo, and texture do.
- Overview
- The A# minor key sets its stable tones and typical harmonic connections. Major keys are built on the Ionian mode (steps 2 – 2 – 1 – 2 – 2 – 2 – 1), minor keys on the Aeolian (2 – 1 – 2 – 2 – 1 – 2 – 2). The number of accidentals marks the key's position on the circle of fifths.
Key composition
1A#root
2B#major 2nd
b3C#minor 3rd
4D#perfect 4th
5E#perfect 5th
b6F#minor 6th
b7G#minor 7th
Key construction
- Interval formula
- A#WB#HC#WD#WE#HF#WG#
- Explanation
- The natural minor scale follows the pattern whole, half, whole, whole, half, whole, whole. Scale degree 3 defines the minor quality; harmonic and melodic minor alter degrees 6 and 7 for voice leading and dominant function.
Related keys
- Relative key
- C# major
- Parallel key
- A# major
- Reference mode
- A# Aeolian (natural minor)
Harmonic functions
TTonicI (A#), iv (D#m)
SSubdominantIII (C#), VI (F#)
DDominantvii (G#m)
- Overview
- Tonic is the stable centre of a key. Predominant function moves away from tonic and prepares dominant; dominant points toward resolution in tonic. The scheme Tonic → Predominant → Dominant → Tonic describes a basic functional progression but does not exhaust tonal harmony.
Chords by degree
Primary triads
- Tonic triad 1 – 3 – 5
- Subdominant triad 4 – 6 – 1
- Dominant triad 5 – 7 – 2
A#—C#—E#
F#—A#—C#
G#—B#—D#
Tensions & resolutions
bVIIG#G#
iA#A#
In natural minor, scale degree 7 lies a whole step below tonic; raising it creates a leading tone.
iiB#B#
iA#A#
Scale degree 2 may resolve downward by step to tonic.
Harmonic context
A# minor is a minor key. Natural, harmonic, and melodic forms vary scale degrees 6 and 7, so chord content and voice leading depend on context.
Natural progressions
Cadences
VE#E#
iA#A#
Authentic cadence with a major dominant (raised 7th) confirms the minor center.
ivF#F#
VE#E#
iA#A#
A complete functional progression moves from minor predominant through major dominant to tonic.
This key on guitar 🎸
See how A# minor looks on guitar.
Circle of fifths
Usage & Practice
Application in music
- Natural minor supplies the basic diatonic collection, while harmonic and melodic forms alter scale degrees 6 and 7 according to voice leading.
- Major dominant V with raised scale degree 7 creates a strong resolution into minor tonic i.
- Patterns such as i – VI – III – VII can be transposed into this key without changing scale-degree relationships.
- Minor quality provides a clear contrast with major, but specific character also depends on melody, rhythm, register, tempo, texture, and timbre.
Practice
- Play the tonic chord (A#), then compare it with the other diatonic chords: tonic serves as the stable centre of the key.
- Alternate A# and G#m (I – V – I), focusing on the leading tone resolving to tonic.
- Add F# (IV): play F# – G#m – A# to hear predominant–dominant–tonic motion.
- Sing the key's scale, emphasizing degrees I, III and V — these are the anchor notes.
- Improvise a melody starting and ending on the tonic to reinforce the sense of center.
Keyboard Trainer
Reinforce it in practice — play and name notes on the interactive keyboard.