The B-sharp diminished seventh chord is a highly tense and dramatic chord consisting of the notes B♯, D♯, F♯, and A. Built on a diminished triad with an added diminished seventh, this chord creates a strong sense of instability and suspense, making it a powerful tool for leading into resolutions or transitioning between keys. The B♯, D♯, and F♯ form a dissonant minor-like foundation, while the A introduces the diminished seventh interval that intensifies the chord’s dark and mysterious character. The B-sharp diminished seventh chord is ideal for adding emotional depth and tension to musical progressions, providing a striking and expressive harmonic element.
Name: B-sharp diminished seventh chord
Symnonyms:: B-sharp fully diminished chord
Notes: B♯, D♯, F♯, A
Intervals: 1, ♭3, ♭5, 𝄫7
Chord symbol: B♯o7
Alternative symbols: B♯dim7, B♯dim, B♯o
Type: Tetrad (four-note chord)
B-sharp diminished seventh chord on the Staff
B-sharp diminished seventh chord on Piano
B-sharp diminished seventh chord on Guitar
B-sharp 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.