The C dominant seventh sharp ninth chord (C7♯9) is a distinctive and expressive chord that stands out due to its unique combination of intervals. Comprising the notes C, E, G, B♭, and D♯, this chord is constructed by adding a sharp ninth (D♯) to the traditional dominant seventh chord (C, E, G, B♭). The inclusion of the sharp ninth creates a dissonant interval that adds tension and a sense of urgency, making the C dominant seventh sharp ninth chord particularly effective in genres like blues, jazz, and rock. Its bold and edgy sound has earned it the nickname “Hendrix chord,” famously used by Jimi Hendrix in songs like “Purple Haze.” The C dominant seventh sharp ninth chord is often employed as a turnaround chord, leading back to the tonic and propelling the harmonic progression forward with its compelling and unresolved character.
Name: C dominant seventh sharp ninth chord
Symnonyms:: C dominant sharp ninth chord
Notes: C, E, G, B♭, D♯
Intervals: 1, 3, 5, ♭7, ♯9
Chord symbol: C7(♯9)
Alternative symbols: C7♯9
Type: Pentad (five-note chord)
C dominant seventh sharp ninth chord on the Staff
C dominant seventh sharp ninth chord on Piano
C dominant seventh sharp ninth chord on Guitar
C dominant seventh sharp ninth 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.