Also Cdim7, D#dim7

Adim7 (A diminished 7th): A C E♭ G♭. Formula 1 ♭3 ♭5 ♭♭7. Also Cdim7, D#dim7, F#dim7. Minor 3rds stacked all the way: symmetrical and very tense, it works as a passing chord and as a dominant with a ♭9.

Made of4

Notes4

Contains & part of20

Scales that contain it20

Inversions4

  • Adim77

    Root position · A C E♭ G♭

  • Adim7/C6/5

    1st inversion · C E♭ G♭ A

  • Adim7/E♭4/3

    2nd inversion · E♭ G♭ A C

  • Adim7/G♭4/2

    3rd inversion · G♭ A C E♭

Relatives8

Same notes, other names3

Type1

Genres that use it4

Where it goes13

One small move away12

Its dominant1