Dim & aug familyvii°7 in B♭ harmonic minor
A diminished seventh chord
Adim7A diminished seventh
Piano root position
- Root
- ♭3
- ♭5
- 𝄫7
Guitar standard tuning
Barre · fret 4
Lay your index flat across strings 4 to 2 at fret 4.
Finger: 1 index, 2 middle, 3 ring, 4 little
Notation treble clef
Intervals
12 semitones- A1
- ♭2
- 2
- C♭3
- 3
- 4
- E♭♭5
- 5
- ♯5
- G♭𝄫7
- ♭7
- 7
- A Root
- C Minor 3rd
- E♭ Diminished 5th
- G♭ Diminished 7th
About this chord
What is an A diminished seventh chord?
Adim7 is built from 4 notes: A (the root), C (the ♭3), E♭ (the ♭5), G♭ (the 𝄫7). Symmetrical stacked minor thirds: dramatic, silent-film suspense.
- Notes
- A · C · E♭ · G♭
- Formula
- 1 · ♭3 · ♭5 · 𝄫7
- Also written
- A°7 · Ao7
- Found in
- vii°7 in B♭ harmonic minor
Neighbours
Chords close to Adim7
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D♭
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F
G♭
G
A♭
A
B♭