How to Play Cdim on Piano
The C Diminished chord sounds tense and unsettled. It stacks 3 notes: C – Eb – Gb.
Two stacked minor thirds. Its fifth is squeezed a semitone flat, so the chord has no stable footing and wants to move.
Notes in Cdim
| Note | Interval | Finger |
|---|---|---|
| CC4 | Root | 1 |
| EbEb4 | Minor 3rd | 3 |
| GbGb4 | Diminished 5th | 5 |
How to Play
Right Hand
Place your thumb (finger 1) on C. Use finger 3 on Eb and finger 5 on Gb.
Where it sits
2 notes of this chord (Eb, Gb) are on black keys, so play it a little further back on the keys than an all-white shape.
Press all 3 keys at the same time. Keep your wrist relaxed and your fingers curved. The blue dots on the piano below show exactly which keys to press — they turn green when you play the right note.