B♭ Minor 9th Chord

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Formula R – 9 – ♭3 – 5 – ♭7

Summary

B♭ Minor 9th is built from the notes B♭, C, D♭, F, A♭. The interval from B♭ to C is a major 2nd (2 semitones), from B♭ to D♭ is a minor 3rd (3 semitones), from B♭ to F is a perfect 5th (7 semitones), from B♭ to A♭ is a minor 7th (10 semitones). This chord contains 3 flatted notes.

The minor 9th takes the smooth minor 7th and adds a shimmering 9th on top, creating one of the most soulful chords in music. It's the sound of late-night R&B, lo-fi beats, and jazz ballads — warm, deep, and effortlessly cool.

Theory

Built from R, ♭3, 5, ♭7, 9, the minor 9th extends the minor 7th with a major 9th. The 9th adds brightness to the minor chord without losing its melancholic identity. It naturally appears on the 2nd, 3rd, and 6th degrees of the major scale. As the 2nd chord in a key, it's the launching pad for some of the smoothest progressions in jazz.

On the guitar

The most practical voicings drop the 5th, keeping root, ♭3, ♭7, and 9. A useful shortcut: play a major 7th chord built on the ♭3 of the root (E♭maj7 voicing for Cm9) — same notes, instant m9. The classic 5th-string root shape is comfortable and movable across the neck.

Advanced

Minor 9th chords are the backbone of neo-soul and lo-fi harmony — they create that laid-back, floating atmosphere. Try stacking m9 voicings in fourths for a modern, open sound. In R&B, alternating between m9 and m11 on the same root gives you subtle harmonic motion without ever leaving the groove.

Piano