Cdim7add#9 Diminished
The Cdim7add#9 chord is built from the notes C – Eb – Gb – Bbb – D#.
Piano sound loads on first tap.
Also known as
Cmindim15Co(add#9)Co(add15)
Chord tones, one by one
CRoot
Root
The fundamental note the chord is built on — C.
EbThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
GbFifth
Diminished fifth (♭5)
Six semitones — a flat fifth. Creates instability, typical of m7♭5 and diminished chords.
BbbSeventh
Diminished seventh (♭♭7)
Nine semitones — a doubly-flat seventh, found in fully diminished 7th chords.
D#Extension
Sharp ninth (♯9)
A ♯9 — the gritty 'Hendrix' tension over a dominant chord.
🎼 Related scales
🎹 Modal analysis
This chord implies the Whole-half diminished scale.
🎸 Genres
Bebop jazz · Hard bop · Gypsy jazz