A♯/B♭ Major Chord on Piano: Notes, Fingering & Inversions

Root position: either hand, fingers low note to high
Hand	Notes	Fingers
Right	A♯, C×, E♯	1-3-5
Left	A♯, C×, E♯	5-3-1

Scale degree, note, and interval measured from the root.
Degree	Note	Interval from root	Semitones
1	A♯	Perfect unison	0
3	C×	Major third	4
5	E♯	Perfect fifth	7

Construction

A♯ Major = Root + Major 3rd + Perfect 5th = A♯, C♯♯, E♯

Note	Interval	Degree
A♯	Root	1
C♯♯	Major 3rd	3
E♯	Perfect 5th	5

Fingering

Note	Key color	Right hand	Left hand
A♯	black	thumb (1)	little finger (5)
C♯♯	white	middle finger (3)	middle finger (3)
E♯	white	little finger (5)	thumb (1)

Right hand: thumb (1) on A♯, middle finger (3) on C♯♯, little finger (5) on E♯.

Left hand: little finger (5) on A♯, middle finger (3) on C♯♯, thumb (1) on E♯.

A♯ Major Inversions

Root position
A♯ – C♯♯ – E♯
1st inversion (A♯/C♯♯)
C♯♯ – E♯ – A♯
2nd inversion (A♯/E♯)
E♯ – A♯ – C♯♯

Key Signature

A chord has no key signature of its own, but the A♯ Major is the tonic (I) chord of A♯ Major, whose key signature has 2 flats (B♭, E♭).

B♭E♭

Order of flats

Flats are added in a fixed order — the reverse of the sharp order. Each new flat key adds the next flat on the list.

B♭E♭A♭D♭G♭C♭F♭

Mnemonic: Battle Ends And Down Goes Charles’ Father

Chords in the Key of A♯ Major

These are the triads built on each degree of A♯ Major:

I — A♯ Major (major)

Degree	Numeral	Chord	Quality
1	I	A♯ Major	Major
2	ii	B♯ Minor	Minor
3	iii	C♯♯ Minor	Minor
4	IV	D♯ Major	Major
5	V	E♯ Major	Major
6	vi	F♯♯ Minor	Minor
7	vii°	G♯♯ Diminished	Diminished

Scales That Include the A♯ Major

Eb Major (V)
Bb Major (I)
F Major (IV)
D Minor (VI)
G Minor (III)
C Minor (VII)
F Dorian (IV)
G Phrygian (III)

A♯ Major : Frequently Asked Questions

What is the A♯ Major chord on piano?

The A♯ Major chord contains the notes A♯ – C♯♯ – E♯. On piano, play these notes together to sound the chord.

What is the A# piano chord?

The A# piano chord (written A♯ Major) uses the same keys: A♯ – C♯♯ – E♯. The # and ♯ symbols name the same black key.

What notes make up the A# Major chord?

A# Major contains three notes: A# (root), C## (major third), and E# (perfect fifth). C## is enharmonically D, and E# is enharmonically F. A# Major is the enharmonic equivalent of Bb Major.

What fingering do I use for A# Major?

Right hand: finger 2 on A#, finger 3 on C##/D, finger 4 on E#/F. Left hand: finger 3 on A#, finger 2 on D, finger 1 on F. In all practical contexts, this is read and played as Bb Major (Bb–D–F).

Is A# Major commonly used?

A# Major is essentially never used in published music. Its key signature requires double sharps (C## and others), making it far harder to read than its enharmonic equivalent Bb Major, which uses only 2 flats. Bb Major is universally preferred.

What is the relationship between A# Major and Bb Major?

They are enharmonically identical: same piano keys, different spellings. A# Major has a theoretically complex key signature with double sharps. Bb Major (Bb–D–F) uses Bb and Eb as its only alterations, making it far more practical and universally used.

What songs would use A# Major?

In practice, all such music is written in Bb Major. Songs in Bb Major include Lean On Me (Bill Withers), With or Without You (U2, partly), and the majority of jazz standards written for brass instruments. All of these should be studied as Bb Major.

Should I practise A# Major separately from Bb Major?

No: the piano keys are identical. Fully mastering Bb Major covers A# Major completely. The distinction only matters in music theory notation, not in piano performance.

A♯ Major in detail

Exact

Every pitch class is present and nothing outside the chord is added.

Type	Notes	Semitones	Span	Omissions and additions	Set relation
Close, root position	A♯3 C×4 E♯4	7	96 mm	none	identical
Close, first inversion	C×4 E♯4 A♯4	8	110 mm	none	identical
Close, second inversion	E♯4 A♯4 C×5	9	124 mm	none	identical
Open, fifth on top	A♯2 E♯3 C×4	16	220 mm	none	identical

Reduced

A subset of the pitch classes: the identity is incomplete rather than altered.

Type	Notes	Semitones	Span	Omissions and additions	Set relation	Fit
Root and third only	A♯3 C×4	4	55 mm	omits E♯	subset

Spans are measured centre to centre at a 165 mm octave (standard keyboard geometry).

Position	Bass note	Notes in order	Figured bass	Semitones	Span
Root position	A♯	A♯3, C×4, E♯4	5/3	7	96 mm
First inversion: A♯/C×	C×	C×4, E♯4, A♯4	6/3	8	110 mm
Second inversion: A♯/E♯	E♯	E♯4, A♯4, C×5	6/4	9	124 mm

One position per chord tone in the bass. Spans are for close position: voiced inversions appear under Voicings.

Progression	Key	Role	Sequence	Voice leading
♭VII, i	C minor	♭VII	B♭ to Cm	A♯ opens the phrase
♭VI, iv, i, v	D minor	♭VI	B♭ to Gm to Dm to Am	A♯ opens the phrase
i, ♭VI	D minor	♭VI	Dm to B♭	2 tones held from Dm
V, I	E♭ major	V	B♭ to E♭	A♯ opens the phrase
ii, V, I	E♭ major	V	Fm to B♭ to E♭	1 tone held from Fm
IV, V, I	F major	IV	B♭ to C to F	A♯ opens the phrase
I, IV	F major	IV	F to B♭	1 tone held from F

Root motion, common tones and voice displacement are computed from pitch class sets. Roman numerals follow common practice functional harmony.

Which keys it belongs to

Key	Roman numeral	Function
C minor	♭VII	Subtonic
D minor	♭VI	Pre-dominant color
E♭ major	V	Dominant, wants to resolve
F major	IV	Subdominant, away from home
G minor	♭III	Relative-major color
B♭ major	I	Tonic, home

Classification system: common-practice functional harmony.

Change one note

Chords a single note away, and what moving that note does.

Chord	Change	Formula	Common tones
A♯maj7	adds G×	1 3 5 7	3
A♯7	adds G♯	1 3 5 ♭7	3
A♯6	adds F×	1 3 5 6	3
A♯add9	adds B♯	1 3 5 9	3
A♯m	C× becomes C♯	1 ♭3 5	2
A♯aug	E♯ becomes E×	1 3 ♯5	2
A♯sus2	C× becomes B♯	1 2 5	2
A♯sus4	C× becomes D♯	1 4 5	2
A♯m7	C× becomes C♯, G♯	1 ♭3 5 ♭7	2
A♯mMaj7	C× becomes C♯, G×	1 ♭3 5 7	2
A♯aug7	E♯ becomes E×, G♯	1 3 ♯5 ♭7	2
A♯7sus4	C× becomes D♯, G♯	1 4 5 ♭7	2

Frequencies

Note	MIDI	Frequency
A♯3	58	233.08 Hz
C×4	62	293.66 Hz
E♯4	65	349.23 Hz

Reference pitch A440, 12-TET, close root position.

Set theory: prime form, Forte number, interval vector

Absolute pitch class set: {10, 2, 5}
Normal order: [10, 2, 5]
Prime form: (037)
Forte number: 3-11
Interval vector: <001110>

Pair	Interval	Semitones	Interval class
A♯ to C×	Major third	4	4
A♯ to E♯	Perfect fifth	7	5
C× to E♯	Minor third	3	3

Where these facts come from

Every value on this page is derived from the note formula for a major applied to the root A♯, using standard music theory. Nothing here is hand-entered per chord, so the notes, intervals, inversions and frequencies cannot drift out of agreement with each other. Pitches assume 12-TET at A440.

A♯ Major

Fingerings

A♯ Major: notes and degrees