All chords

C Eb Gb A: C diminished seventh chord

Keyriff names these keys Cdim7. It also reads them as D#dim7/C, F#dim7/C and Adim7/C. In C diminished seventh they’re spelled C Eb Gb Bbb.

• Root position of Cdim7
• Third inversion of D#dim7
• Second inversion of F#dim7
• First inversion of Adim7