B flat Minor ninth flat fifth

The minor ninth flat fifth chord extends the half-diminished frame with a ninth (1-♭3-♭5-♭7-9). It keeps the searching quality of m7♭5 while the ninth adds width and a more modern jazz color—common as ø9 on ii in minor and in contemporary voicing studies.

Construction

Start from m7♭5 and add 9. In Cm9♭5, include D as the ninth.

Usage

iiø9–V progressions, altered pre-dominant colors, and linear improvisation targets.

Examples

• Minor-key jazz standards with rich ii chords
• Modern arranging on half-diminished harmony
• Voice-leading exercises emphasizing 9 as a melody tone

Play

Prioritize ♭3 and ♭7 guide tones; place the ninth where it sings without clashing the bass.

Ear-training cues

Half-diminished core with a bright ninth above.