The distance spanning nine note names, with 13 semitones between them.
Chords whose formulas include this interval from the root note.
Scales whose formulas include this interval.
Intervals with a comparable quality and character.
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The minor ninth (m9) spans 13 semitones. It is the compound form of the minor second and is one of the sharpest extension tensions in tonal and jazz harmony.
m9 is built as an octave plus minor second, for example C-Db above the octave. It keeps clear semitone friction while expanding register. The spelling preserves ninth-function context.
Harmonically, m9 appears in altered dominants, minor-major tensions, and dramatic color chords. Melodically, it creates urgent pull and expressive instability. It is used when strong directional tension is desired.
Practice m9 against m2 to hear identical quality in compound range. Resolve m9 to stable tones to internalize tension-release behavior. This improves control of dissonant extensions.