+**9b5** (nine-flat-five) refers to a common [Chord](/wiki/chord) alteration in [Music Theory](/wiki/music_theory), where the fifth degree of a chord is lowered by a semitone. This creates a distinct, often tense, harmonic color, frequently employed in jazz and contemporary composition to add unique character. It reshapes the sonority, inviting new melodic and harmonic paths.
+## See also
+- [Harmony](/wiki/harmony)
+- [Interval](/wiki/interval)
+- [Jazz](/wiki/jazz)
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