The B dominant seventh flat five chord, also known as B7♭5, is a four-note chord that introduces a distinctive tension into musical progressions. Comprising the notes B (root), D♯ (major third), F (diminished fifth), and A (minor seventh), this chord is constructed by lowering the fifth of the B dominant seventh chord by a half step. The diminished fifth interval (tritone) between D♯ and F creates a dissonant and unstable sound, making the B7♭5 chord a powerful tool for adding drama and complexity to compositions. This chord is commonly used in jazz and blues to create a dark, unresolved atmosphere, often functioning as a passing chord or as part of a tritone substitution. Its unique tonal quality makes it a valuable addition to a musician’s harmonic vocabulary, offering a rich palette for expressive musical exploration.
Name: B dominant seventh flat five chord
Notes: B, D♯, F, A
Intervals: 1, 3, ♭5, ♭7
Chord symbol: B7(♭5)
Alternative symbols: B7♭5
Type: Tetrad (four-note chord)
B dominant seventh flat five chord on the Staff
B dominant seventh flat five chord on Piano
B dominant seventh flat five chord on Guitar
B dominant seventh flat five 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.