C♯dim / D♭dim Chord on Guitar

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C♯dim (also written D♭dim) is a diminished chord made of 3 notes: C♯, E, G. It sounds tense and unstable, and you hear it in passing chords between two others, and the vii chord of a major key. It is the vii° chord of D major and turns up in 1 other key.

The library above opens on C♯dim with 14 shapes up and down the neck. Tap a shape to hear it, or play it one string at a time.

Notes in C♯dim

NoteDegreeInterval from C♯Semitones
C♯1root0
E♭3minor third3
G♭5diminished fifth6

Formula: 1 – ♭3 – ♭5. With the other spelling, D♭dim is D♭, F♭, A𝄫: the same sounds under different names.

How to play C♯dim

312
Open positionBeginnerx42020
4fr123
Fret 4Beginnerx45050
9fr1342
Fret 9Easy9(10)(11)9xx
3fr321
Fret 3Easyxxx653
8fr321
Fret 8Easyxx(11)98x
11fr123
Fret 11Easyxx(11)(12)x(12)

Open position (root on the 5th string), step by step

  1. 1st finger (index): 4th string, 2nd fret (E, the minor third).
  2. 2nd finger (middle): 2nd string, 2nd fret (C♯, the root).
  3. 3rd finger (ring): 5th string, 4th fret (C♯, the root).
  4. Let the 3rd string, 1st string ring open (G, E).
  5. Strum from the 5th string, and keep the 6th string quiet.

Tips

The open position shape is the one to learn first. Once it is easy, try the shape at the 9th fret (9(10)(11)9xx): the same chord, higher and brighter, handy when the chords before and after it sit up the neck.

Keys and progressions with C♯dim

C♯dim belongs to 2 keys: vii° in D major, ii° in B minor. In D major, try I–V–vi–IV: D – A – Bm – G.

Common questions

What notes are in C♯dim?

C♯, E, G: the root, minor third, flat fifth.

What is the easiest way to play C♯dim?

Open position: x42020 (low string first), rated Beginner.

What is the difference between C♯dim and C♯dim7?

C♯dim has the same notes where C♯dim7 has B♭. C♯dim sounds tense and unstable; C♯dim7 sounds spooky and suspenseful.

Is C♯dim a hard chord?

No. The easiest shape is rated Beginner and needs 3 fingers.

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