The B♭ Minor 9th chord is a five-note chord made up of B♭, D♭, F, A♭, and C. It is built from a root, minor third, perfect fifth, minor seventh, and major ninth.
Construction
B♭ Minor 9th = Root + Minor 3rd + Perfect 5th + Minor 7th + Major 2nd = B♭ · D♭ · F · A♭ · C
| Note | Interval | Degree |
|---|---|---|
| B♭ | Root | 1 |
| D♭ | Minor 3rd | ♭3 |
| F | Perfect 5th | 5 |
| A♭ | Minor 7th | ♭7 |
| C | Major 2nd | 9 |
Key Signature
A chord has no key signature of its own, but the B♭ Minor 9th is the tonic (i) chord of Bb Minor, which shares the signature of its relative major, Db Major — 5 flats (B♭, E♭, A♭, D♭, G♭).
B♭E♭A♭D♭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
Chords in the Key of B♭ Minor
These are the triads built on each degree of the B♭ minor scale:
B♭ Minor 9th — Frequently Asked Questions
What is the B♭ Minor 9th chord on piano?
The B♭ Minor 9th chord contains the notes B♭ – D♭ – F – A♭ – C. On piano, play these notes together to sound the chord.
What notes are in the Bb Minor 9th chord?
The Bb Minor 9th chord (Bbm9) contains five notes: Bb (root), Db (minor third), F (perfect fifth), Ab (minor seventh), and C (major ninth). It is Bbm7 with an added ninth.
How does Bbm9 differ from Bb9?
Bbm9 has a minor third (Db). Bb9 has a major third (D). Bbm9 is dark and smooth; Bb9 is dominant.
How is Bbm9 used in music?
Bbm9 is the ii in Ab Major (Bbm9–Eb13–Abmaj9) — a common jazz ii–V–I. It appears in jazz, R&B, and gospel.
What songs use Minor 9th chords?
Minor 9th chords define neo-soul and lo-fi. Bbm9 is common in jazz and R&B in Ab Major.
How does Bbm9 differ from Bbm7?
Bbm9 adds the ninth (C) for richer colour.
Do I need to play all five notes?
No — drop the fifth: Bb–Db–Ab–C is practical.