The C half-diminished seventh chord (Cm7♭5) is a tense and harmonically intriguing chord that combines the characteristics of a diminished triad with a minor seventh interval. Comprising the notes C, E♭, G♭, and B♭, it produces a dark, unresolved sound that is often used to create suspense and drive within chord progressions. The C half-diminished seventh chord is commonly found in jazz, classical, and contemporary music, where it serves as a passing or approach chord, adding complexity and emotional depth. Its unique tonal quality allows composers and musicians to explore rich harmonic landscapes while maintaining a sense of forward motion and anticipation.
Name: C half-diminished seventh chord
Symnonyms:: C half-diminished chord, C minor seventh flat five chord
Notes: C, E♭, G♭, B♭
Intervals: 1, ♭3, ♭5, ♭7
Chord symbol: Cm7(♭5)
Alternative symbols: Cø, Cø7, Cm7♭5, C–7(♭5), Cmi7(♭5), CminCmin
Type: Tetrad (four-note chord)
C half-diminished seventh chord on the Staff
C half-diminished seventh chord on Piano
C half-diminished seventh chord on Guitar
C half-diminished seventh chord on Ukulele
Rowan Ellis is a musician and educator with a passion for exploring the language of harmony and melody. With years of experience across classical, jazz, and contemporary styles, Rowan breaks down music theory into clear, practical insights. His goal is to make chords and scales less intimidating and more inspiring for every musician.