Chords · Cdim7

Diminished 7th chord

Notes

Root
  1. C, the 1
  2. E♭, the ♭3
  3. G♭, the ♭5
  4. B♭♭, the ♭♭7

Practice it

The chord, then each scale it takes with the chord tones lit, on the root above, written for the pitch you read in.

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Scales

A sheet plays the default at Standard; Basic and Advanced reach for the scales marked for them. How it decides says which, and why.

C Whole-Half Diminished
Default
B♯ Diatonic Diminished
One function onlyan ascending vii°7: the V7♭9♯9♭13 of the chord it leads to
C Diatonic Diminished ♭III
One function onlya passing ♭III°7: its chord tones plus the key's notes
C Diatonic Diminished ♭III optional
One function only♭III°7 with the 9, common with the ii it falls to
C Diatonic Diminished ♭VI
One function onlya passing ♭VI°7: its chord tones plus the key's notes
C Diatonic Diminished I
One function onlyan auxiliary I°7: its chord tones plus the key's notes
C Diatonic Diminished I optional
One function onlyI°7 with the 11 in place of the 3
C Diatonic Diminished V
One function onlyan auxiliary V°7: its chord tones plus the key's notes
C Diatonic Diminished ♯IV
One function only♯IV°7 to I over its 5th: the ♯II°7's notes
B♯ Diatonic Diminished ♯IV optional
One function only♯IV°7 with the major 7th (a blues)
C♯ Harmonic Minor
dim7 as vii of the minor key a half step up

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