The B dominant seventh sharp ninth chord, often abbreviated as B7(#9), is a five-note chord that introduces a distinctive tension into musical progressions. Comprising the notes B (root), D♯ (major third), F♯ (perfect fifth), A (minor seventh), and C𝄪 (augmented ninth), this chord is characterized by the inclusion of the sharp ninth interval, which is a semitone above the natural ninth. This alteration creates a dissonant and edgy sound, making the B7(#9) chord a popular choice in genres such as blues, jazz, and rock. The chord’s structure—root, major third, perfect fifth, minor seventh, and augmented ninth—produces a complex harmonic flavor that can add emotional intensity to compositions. Commonly known as the “Hendrix chord,” it has been famously utilized in Jimi Hendrix’s music to evoke a raw, expressive quality. On the guitar, the B7(#9) chord is typically played using various voicings that emphasize the altered ninth interval, allowing musicians to incorporate its unique sound into their playing. Its versatility and striking tonal characteristics make the B7(#9) chord a valuable tool for adding depth and drama to musical pieces. The inclusion of the augmented ninth interval distinguishes it from the standard dominant seventh chord, offering a richer and more complex harmonic palette. Overall, the B7(#9) chord serves as a powerful expressive device in the hands of musicians, capable of conveying a wide range of emotions and enhancing the dynamic quality of musical works.
Name: B dominant seventh sharp ninth chord
Symnonyms:: B dominant sharp ninth chord
Notes: B, D♯, F♯, A, C𝄪
Intervals: 1, 3, 5, ♭7, ♯9
Chord symbol: B7(♯9)
Alternative symbols: B7♯9
Type: Pentad (five-note chord)
B dominant seventh sharp ninth chord on the Staff
B dominant seventh sharp ninth chord on Piano
B dominant seventh sharp ninth chord on Guitar
B 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.