The A diminished seventh chord is a highly tense and dramatic chord that builds on the diminished triad by adding a diminished seventh, creating a sound full of suspense and urgency. Its notes, A, C, E♭, and G♭, combine to form a chord that is dark, dissonant, and perfect for leading into resolutions with strong harmonic impact. This chord is frequently used in classical, jazz, and cinematic music to heighten emotional intensity and create a sense of instability within progressions. The A diminished seventh chord provides musicians with a powerful tool to add tension, complexity, and striking color to their compositions.
Name: A diminished seventh chord
Symnonyms:: A fully diminished chord
Notes: A, C, E♭, G♭
Intervals: 1, ♭3, ♭5, 𝄫7
Chord symbol: Ao7
Alternative symbols: Adim7, Adim, Ao
Type: Tetrad (four-note chord)
A diminished seventh chord on the Staff
A diminished seventh chord on Piano
A diminished seventh chord on Guitar
A 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.