The C Minor 9th chord is a five-note chord made up of C, E♭, G, B♭, and D. It is built from a root, minor third, perfect fifth, minor seventh, and major ninth.
Construction
C Minor 9th = Root + Minor 3rd + Perfect 5th + Minor 7th + Major 2nd = C · E♭ · G · B♭ · D
| Note | Interval | Degree |
|---|---|---|
| C | Root | 1 |
| E♭ | Minor 3rd | ♭3 |
| G | Perfect 5th | 5 |
| B♭ | Minor 7th | ♭7 |
| D | Major 2nd | 9 |
Key Signature
A chord has no key signature of its own, but the C Minor 9th is the tonic (i) chord of C Minor, which shares the signature of its relative major, Eb Major — 3 flats (B♭, E♭, A♭).
B♭E♭A♭
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 C Minor
These are the triads built on each degree of the C minor scale:
C Minor 9th — Frequently Asked Questions
What is the C Minor 9th chord on piano?
The C Minor 9th chord contains the notes C – E♭ – G – B♭ – D. On piano, play these notes together to sound the chord.
What notes are in the C Minor 9th chord?
The C Minor 9th chord (Cm9) contains five notes: C (root), Eb (minor third), G (perfect fifth), Bb (minor seventh), and D (major ninth). It is Cm7 with an added ninth — dark yet lush.
How does Cm9 differ from C9?
Cm9 has a minor third (Eb). C9 has a major third (E). Cm9 is dark and smooth; C9 is bright and bluesy. Both have a minor seventh and ninth, but the third defines whether it is minor or dominant.
How does Cm9 differ from Cm7?
Cm9 adds the ninth (D) to Cm7. The ninth adds openness and colour on top of the minor seventh's smooth quality. Cm9 sounds richer and more sophisticated.
How is Cm9 used in music?
Cm9 is the ii chord in Bb Major jazz harmony (Cm9–F13–Bbmaj9). It is a staple of neo-soul, lo-fi hip-hop, R&B, and jazz. Cm9 also works as a i chord in C minor for a lush, modern minor sound.
What songs use Minor 9th chords?
Minor 9th chords define neo-soul and lo-fi: D'Angelo, Erykah Badu, and Robert Glasper use m9 chords as building blocks. So What by Miles Davis features minor voicings that are essentially m9 shapes. Lo-fi hip-hop producers build entire beats on m9 loops.
Do I need to play all five notes?
No — drop the fifth: C–Eb–Bb–D is a clean four-note voicing. Or use the rootless voicing Eb–G–Bb–D (an Ebmaj7 shape over C bass).