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The three diminished 7th chords in music:
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Diminished 7th Chord This diminished 7th chord will work for:
  • Cdim7
  • Ebdim7 (same as D#dim7)
  • Gbdim7 (same as F#dim7)
  • Adim7
Diminished 7th Chord This diminished 7th chord will work for:
  • C#dim7 (same as Dbdim7)
  • Edim7
  • Gdim7
  • Bbdim7 (same as A#dim7)
Diminished 7th Chord This diminished 7th chord will work for:
  • Ddim7
  • Fdim7
  • G#dim7 (same as Abdim7)
  • Bdim7

View these Dim 7th chords in their root positions

Note that in the above link, you'll see what looks like twelve different Dim 7th chords.

However, you'll see that each of those twelve chords shares identical notes with one of the three chords on this page. This is the secret to boiling all of the Dimished 7th chords down to just three chords.