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Mode · Reference entry

A♯ Ionian Mode

Ionian mode · A♯ – B♯ – C♯♯ – D♯ – E♯ – F♯♯ – G♯♯ – A♯ · intervals P1-M2-M3-P4-P5-M6-M7-P8

The A♯ Ionian Mode contains the notes A♯, B♯, C♯♯, D♯, E♯, F♯♯, and G♯♯. Its step pattern is W-W-H-W-W-W-H. The bright, resolved sound of the major scale — the home base of Western tonal music.

B♭ Ionian Mode
This is the same scale as B♭ Ionian Mode — the same keys on the keyboard, spelled with flats.
A♯ Major Scale →

At the keyboard

A# · B# · C## · D# · E# · F## · G##
Maintained by Justin Evans, a pianist of 25 years
Maintained for accuracy · Last updated July 2026 · How we review
Flashcards · Scale
Three questions on A♯ Ionian Mode
Answer on the keyboard, not with buttons. No login required.

The A♯ Major scale contains seven notes: A♯, B♯, C♯♯, D♯, E♯, F♯♯, and G♯♯. It follows the whole-step / half-step pattern W-W-H-W-W-W-H.

The A♯ Major scale is a diatonic major scale that consists of eight notes: A♯, B♯, C♯♯, D♯, E♯, F♯♯, and G♯♯ (returning to A♯). It follows the major scale step pattern of W-W-H-W-W-W-H and is the enharmonic equivalent of the B♭ Major scale. Like all major scales, it has a bright, happy character widely used across classical, pop, and jazz music.

A♯ Ionian Mode Notes

DegreeNameNoteInterval
1TonicA♯P1
2SupertonicB♯M2
3MediantC♯♯M3
4SubdominantD♯P4
5DominantE♯P5
6SubmediantF♯♯M6
7Leading ToneG♯♯M7
8OctaveA♯P8

How to Play the A♯ Ionian Mode

Practice the A♯ Ionian Mode hands separately at a slow, steady tempo before putting them together. Aim for even rhythm and a relaxed wrist — the goal is a smooth, connected line where every note sounds the same length and volume. Once both hands feel comfortable on their own, layer them at the same slow tempo and only speed up when the joined version is clean.

Right Hand (RH)

Place your right hand over the keys with the thumb on the root. Use the fingering: 2-1-3-1-2-3-1-2 — 1 = thumb, 2 = index, 3 = middle, 4 = ring, 5 = pinky.

Watch for the thumb tuck: the thumb (1) passes under your fingers at notes 2, 4, 7. Keep your wrist level and quiet — only the thumb moves under, the hand stays in place above the keys.

Left Hand (LH)

For the left hand, start with your pinky on the root. Use the fingering: 2-1-4-3-1-3-2-1

Watch for the crossover: a long finger (3 or 4) crosses over the thumb at notes 3, 6. Lift the long finger over cleanly without disturbing the thumb. Descending the scale, the thumb will pass under at the same spots in reverse.

Practice routine

  1. One octave, ascending only, right hand alone — slow and even.
  2. One octave, ascending and descending, right hand alone.
  3. Repeat steps 1–2 with the left hand alone.
  4. Hands together, ascending and descending, at the same slow tempo.
  5. Two octaves hands together once step 4 feels comfortable.
  6. Increase the tempo only when the previous tempo is fully clean.

Key Signature

The A♯ Ionian Mode draws its notes from Bb Major, so it is written with that key signature: 2 flats (B♭, E♭).

B♭E♭

Written as accidentals

A♯B♯C♯♯D♯E♯F♯♯G♯♯

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

Diatonic Chords in the A♯ Ionian Mode

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

C1C2C3C4C5DFC6C7C8A#
I — A♯ Major (major)
DegreeNumeralChordQuality
1IA♯ MajorMajor
2iiB♯ MinorMinor
3iiiC♯♯ MinorMinor
4IVD♯ MajorMajor
5VE♯ MajorMajor
6viF♯♯ MinorMinor
7vii°G♯♯ DiminishedDiminished

How Ionian Relates to the Major Scale

C1C2C3CDFGACDFGAC6C7C8D#A#D#A#
Mode
Key

A♯ Ionian uses the same notes as B♭ Major

Relative modes — all share the same notes
B♭ Ionian=C Dorian=D Phrygian=E♭ Lydian=F Mixolydian=G Aeolian=A Locrian

Common Tones

Common tones are the notes that two scales or modes share. Knowing which notes the A♯ mode shares with its parallel modes (same root, different scale) helps with improvisation, modal interchange, and smooth voice leading. The more notes two modes share, the more closely related they sound — and the easier it is to slide between them in a solo or progression.

Parallel ModeCommon NotesShared / 7
A♯ DorianB♯ – A♯ – C♯♯3 / 7
A♯ PhrygianB♯ – A♯ – C♯♯3 / 7
A♯ LydianB♯ – A♯ – C♯♯3 / 7
A♯ MixolydianB♯ – A♯ – C♯♯3 / 7
A♯ AeolianB♯ – A♯ – C♯♯3 / 7
A♯ LocrianB♯ – A♯ – C♯♯3 / 7

A♯ Ionian Mode — Frequently Asked Questions

What notes are in the A# Major Scale?
The A# Major Scale contains seven notes: Bb C D Eb F G A — plus the octave (Bb again). It has enharmonic with Bb Major. The scale follows the W–W–H–W–W–W–H step pattern (whole and half steps) common to all major scales.
What is the fingering for the A# Major Scale?
Right hand: 21312312 (thumb = 1, index = 2, middle = 3, ring = 4, pinky = 5). Left hand: 32143213. Practice hands separately before combining, and keep each finger curved over the key it presses.
What is the relative minor of A#/Bb Major?
The relative minor of A#/Bb Major is G minor. They share the same key signature and the same seven notes — the difference is which note acts as the tonal centre. G minor begins on the 6th degree of the A#/Bb Major scale.
How do I practise the A# Major Scale effectively?
Start slowly with the right hand alone using the correct fingering. Add the left hand separately, then combine both hands in parallel motion. Gradually increase tempo using a metronome. Aim for even tone on every note — scales should sound smooth, not accented on thumb-crossings.
What chords come from the A# Major Scale?
The seven diatonic chords built from the A# Major Scale are: I (Bb Major), ii minor, iii minor, IV Major, V Major, vi minor, and vii diminished. These seven chords are the harmonic foundation of all music in A#/Bb Major.
What is the formula for any major scale?
Every major scale follows the same whole-step (W) and half-step (H) pattern: W–W–H–W–W–W–H. Starting from any root note, apply this pattern and you will always arrive at the correct major scale for that key. The A# Major Scale applies this formula starting on Bb.

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Entry reviewed and maintained by Justin Evans. Corrections are read and applied.Report an error

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