Piano Chord Encyclopedia
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C Diminished 7th Chord
The C diminished seventh chord (Cdim7): This chord is made up of the notes C, E-flat, G-flat, and B-double flat. It consists of a diminished triad (C-E♭ -G♭) with the addition of a diminished seventh (B-double flat). The Cdim7 chord has a dissonant and unstable sound, and is often used to create tension and instability.
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