Finger Positions

Root Note D

Name D diminished seventh over A

Intervals 1P-3m-5d-7d

Relative Minor Bm

Notes A, D, F, Ab, B

Aliases Ddim7, D°7, Do7

How to play the Ddim7/A Chord

The Ddim7/A is a fundamental dominant chord in guitar music. To play this chord correctly, ensure your fingers are placed precisely on the frets indicated in the diagram above.

Music Theory Analysis

From a theoretical perspective, the D diminished seventh over A is built using the 1P, 3m, 5d, 7d intervals. In the key of D Major, this chord functions as the I chord.

Common Progressions

In music composition, the Ddim7/A chord is often used to create tension or resolution.

I-V-vi-IV

D → A → Bm → G

vi-IV-I-V

Bm → G → D → A

The Diatonic Family

Understanding the "family" of chords that belong to D helps with transposition and ear training.

Triads

D Em F#m G A Bm C#dim

7ths

Dmaj7 Em7 F#m7 Gmaj7 A7 Bm7 C#m7b5

Scale Compatibility

View All Scales

Diminished Ultralocrian Locrian 6 Dorian #4 Lydian Diminished Hungarian Major Lydian #9 Half-Whole Diminished Composite Blues Messiaen's Mode #7 Chromatic

* 11 scales found containing the notes A, D, F, Ab, B.

Acoustic & Digital Analysis

Digital footprint of the Ddim7/A chord for MIDI programming and synthesizer sound design.

MIDI Numbers 69, 62, 65, 68, 71

Frequencies (Hz)

440, 293.6647679174076, 349.2282314330039, 415.3046975799451, 493.8833012561241