The A-flat diminished seventh chord is a highly tense and dramatic chord composed of the notes A♭, C♭, E𝄫, and G𝄫. By stacking minor thirds on top of the diminished triad, this chord generates a strong sense of instability and suspense, making it a powerful tool for leading to resolution in harmonic progressions. Commonly used in classical, jazz, and cinematic music, the A-flat diminished seventh chord adds a dark, mysterious, and emotionally charged color to compositions, enhancing tension and creating strikingly expressive musical moments.
Name: A-flat diminished seventh chord
Symnonyms:: A-flat fully diminished chord
Notes: A♭, C♭, E𝄫, G𝄫
Intervals: 1, ♭3, ♭5, 𝄫7
Chord symbol: A♭o7
Alternative symbols: A♭dim7, A♭dim, A♭o
Type: Tetrad (four-note chord)
A-flat diminished seventh chord on the Staff
A-flat diminished seventh chord on Piano
A-flat diminished seventh chord on Guitar
A-flat 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.