Key of A#
A♯ major is the same key as B♭ major. The key of B♭ major has two flats (B♭, E♭). Its seven notes are B♭, C, D, E♭, F, G, and A. Its relative minor is G Minor, which shares the same notes and key signature. The chords that belong to the key are I B♭ major, ii C minor, iii D minor, IV E♭ major, V F major, vi G minor, vii° A diminished. Its dominant is F major and its subdominant is E♭ major — the keys it most naturally moves toward. Keys built on flats, like B♭ major, are traditionally described as warm and mellow.
Key Signature
The notes of the Bb Major come from Bb Major, so it carries that key signature: 2 flats (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.
Mnemonic: Battle Ends And Down Goes Charles’ Father
Relative minor: G Minor scale — same notes, same key signature, different home note.
Chords in the Key of B♭ Major
Every major key is built from seven diatonic chords — one on each note of the scale. In B♭ major they are I B♭ Major, ii C Minor, iii D Minor, IV E♭ Major, V F Major, vi G Minor, and vii° A Diminished. Tap any chord to light it up on the keyboard.
Common chord progressions in B♭ major
Everything in the key of A#
Every chord, scale, and mode in A# — click any link for the full interactive page with piano diagrams, audio, notation, and fingerings.