Guitar Chord Adim7: Structure, Notes and Theory

Adim7 — a chord built on the note “A” with a strong pull toward resolution and a symmetrical, rich quality. Effectively replaces the dominant and works well in sequential transitions.

Formula and Structure of the Adim7 Chord

Interval formula from the root note: 1 — b3 — b5 — bb7. The chord consists of the following notes:

• A — unison and the main tonal anchor.
• C — minor third with a melancholic character and gentle lyricism.
• Eb — diminished fifth with tritone tension, best used cautiously in the bass.
• Gb — double flat seventh, sounding like a sixth in modern tuning.

Together, these notes form the harmonic foundation of the Adim7 chord, defining its sound and role in the musical context.

Alternative Names for the Adim7 Chord

There are no alternative names for this chord.

Using the Adim7 Chord

Emphasize minor third intervals to bring out the symmetry. Apply in sequences and for modulations. Avoid excessive density in the bass — leave some “air” below.

Conclusion

Adim7 is an expressive and versatile chord. Learn several fingerings, experiment with different positions and voice spacing, then try weaving it into your own playing — this will help you quickly find your unique tone.