Diminished and augmented chords are the tension specialists. They don't sit comfortably on their own - they create a feeling of unrest that your ear wants resolved. That restlessness is exactly what makes them useful. Put one in the right place and it makes the next chord sound twice as satisfying when it arrives.
Diminished Chords
A diminished chord stacks two minor thirds on top of each other. The result is a tense, slightly ominous sound that appears in classical music, jazz, blues, and film scores - any situation where a composer wants harmonic instability.
On ukulele, diminished chords have a useful structural property: the shape repeats every three frets. Move a diminished shape up three frets and you get a different chord name for the same notes. This means there are really only three distinct diminished shapes across the entire fretboard.
CdimDdimGdim
The most common use is as a passing chord between two chords a whole step apart. If you're moving from C to Dm, try putting Cdim or C#dim in between. The diminished chord smooths the motion between them.
Diminished 7th Chords
The diminished 7th (dim7) adds one more note to the diminished triad. It's even more tense than the plain diminished, and it resolves upward by a half step particularly well. In jazz and classical contexts, a dim7 often functions as a substitute for a dominant 7th chord.
Cdim7Gdim7
Augmented Chords
Where diminished stacks two minor thirds, augmented stacks two major thirds. The raised fifth gives the chord a dreamy, unstable quality - it doesn't feel like it belongs to any one key, which can be exactly what you want.
Like diminished shapes, augmented shapes repeat symmetrically. Move up four frets and the same shape appears again under a different name.
CaugGaugEaug
Augmented chords work well as a substitute for the dominant chord (the V chord). In the key of C, try using Gaug instead of G before returning to C. The raised fifth in the augmented chord creates a stronger pull toward the tonic.
Where These Chords Appear in Songs
You don't need to use these chords often to get value from them. Two common situations:
Chromatic passing chord: When moving between two chords, a diminished chord a half step below the destination creates smooth motion. C to D becomes C, C#dim, D.
Variation on the V chord: Replace a standard dominant with its augmented version for a more colorful resolution. Works especially well in slower songs where you have time to let the chord breathe.
Practice Exercise
Start with diminished. Play this slow progression: C, C#dim7, Dm, G7, C. Strum each chord twice. Listen to how the C#dim7 creates movement between C and Dm. The motion feels almost inevitable.
Then try the augmented version: C, C, Caug, F. The Caug acts as a pivot, lifting the F chord when it arrives. This specific sequence appears in a lot of classic songs.
Questions and Answers
What is a diminished chord on ukulele?
A diminished chord is built by stacking two minor thirds: a root, a minor third above it, and another minor third above that. The resulting sound is tense and unstable. On ukulele, diminished shapes repeat every three frets, so there are only three distinct fingering patterns for all 12 diminished chords.
What is the difference between a diminished and an augmented chord?
A diminished chord has a lowered (flattened) fifth, which makes it sound dark and tense, pulling downward. An augmented chord has a raised (sharpened) fifth, which creates an airy, unresolved tension that pulls upward. Both chords are unstable and work best when followed by a chord that resolves their tension.
