AKA: Bb-7(add9), Bb-7/9, Bb Dominant minor 9th, Bb Dominant minor ninth, Bbm7/9, Bbm9, Bbm7(add9), Bbmin7(add9), Bbmin7/9, Bbmin9, Bb minor7/9, Bb minor9
Bbm9 Accordion Chord Chart
It’s a five-note chord that consists of a root, a minor 3rd, a perfect 5th, a minor 7th, and a major 9th. To build an M9 chord, you can also stack intervals on top of each other: a minor 3rd, a major 3rd, a minor 3rd, and a major 3rd.
For example, a Cm9 chord consists of the notes C (root), Eb (minor 3rd), G (perfect 5th), Bb (minor 7th), and D (major 9th) and its intervals are a minor 3rd (C to Eb), a major 3rd (Eb to G), a minor 3rd (G to Bb), and a major 3rd (Bb to D).
These chords are commonly used in jazz music to add some extra color to a chord progression. I love using them in my own playing and I think you should give them a try too. They sound great and can really add something special to your music.
m9 Chords on Accordion
On a standard bass accordion you can play m9th chords by combining a root and/or its minor chord, with the minor chord built on its 5th degree.
For example, in the key of C, the fifth degree is G. To play a Cm9 chord, you would play the C minor chord (C, Eb, G) and the G minor chord (G, Bb, D). This creates a Cm9 chord made up of the notes C, Eb, G, Bb, and D.
B♭, D♭, F, A♭, C
R, m3°, 5°, m7°, 9°
B♭ + B♭m + Fm
4 + 3 + 2