A#dim (A# diminished): A# C# E. Formula 1 ♭3 ♭5. Two minor 3rds stacked: tense and unstable, it is the vii° of a major key and wants to resolve.

Made of3

Notes3

Contains & part of32

Scales that contain it30

Extensions2

Inversions3

  • A#dim5/3

    Root position · A# C# E

  • A#dim/C#6

    1st inversion · C# E A#

  • A#dim/E6/4

    2nd inversion · E A# C#

Relatives3

Type1

Genres that use it2

Where it goes5

One small move away4

Its dominant1