The Caug piano chord is built from the notes C, E, G#. On piano it is played from the keys C, E, G#, root position first, then in inversions. It is a augmented chord, and this page gives you its exact notes, the fingerings that work on the piano, the mistakes to avoid and the progressions it appears in.
What notes are in the Caug chord?
The Caug chord is a augmented chord, and its notes are fixed: C, E, G#. Every voicing on every instrument uses these same notes, in some order and in some octave — change one of them and you are playing a different chord. The table below lists each note with its interval from the root C, so you can see the structure of Caug at a glance. On the piano, play the keys C, E, G# slowly and listen for each note of Caug in turn.
| Note | Interval |
|---|---|
| C | Root |
| E | 3 |
| G# | #5 |
The root is C, the note the chord is named after and the note your ear hears as home. Above it, the intervals in Caug are 3, #5. Those intervals are the fingerprint of the augmented quality — any chord with the same interval pattern, on any root, is the same kind of chord. On the piano, the notes appear in the order the fingering dictates, but the set of notes never changes.
Caug sounds exotic and tense, the sound of a chord that can resolve in several directions at once. Listen for that character when you play it — if Caug does not sound that way, one of the notes is probably wrong, and the table above is the place to check. On the piano, Caug is the keys C, E, G#, and the inversions above move the same notes around.
Comparing Caug with its closest relatives helps to fix it in your ear. In short, augmented against major: both have the major 3rd E, but Caug raises the 5th to G# instead of the perfect 5th G, and that one change removes the chord's sense of home. Hearing the comparison matters more than reading it: play Caug, then play the chord it is compared with above, and let your ear find the note that changed. On the piano, play the keys C, E, G# slowly and listen for each note of Caug in turn.
How to play Caug on piano
On the piano, Caug is played from the keys C, E, G#. In root position the lowest note is C, the root, with the other notes stacked above it in the order C, E, G#. Play it with the right hand first, then with the left hand an octave lower, so both hands know the shape of Caug before you try it in a progression.
First inversion of Caug puts E in the bass, with the notes in the order E, G#, C. The chord is still Caug — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to E rather than jump to C, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
Second inversion of Caug puts G# in the bass, with the notes in the order G#, C, E. The chord is still Caug — the notes have not changed, only their order — but the bass note changes how it connects to the chord before and after it. Use this inversion when the bass line wants to step to G# rather than jump to C, and practise moving from root position to this inversion without lifting your hand off the keys more than you must.
For fingering, a good starting point for Caug in root position in the right hand is thumb on C, then one finger per note in order, with the little finger on the top note G#. For the left hand, mirror it: little finger on the low C and thumb on the top note. When a note is a black key — G# — let your longer fingers take it, since they reach the black keys more easily. Practise Caug in root position and first inversion, hands separately, then together, at a slow tempo, and use the Piano Chord Finder to check the voicing on the keyboard.
Common mistakes
These are the mistakes that most often make Caug sound wrong on the piano, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Playing a perfect 5th. If the 5th is G the chord is just major. The sharpened 5th G# is the whole point of the augmented chord. On the piano, Caug is the keys C, E, G#, and the inversions above move the same notes around.
Sitting on it too long. Caug is a passing colour, not a home chord. Hold it for a beat or two, then move on — it sounds stranger the longer it lasts. On the piano, Caug is the keys C, E, G#, and the inversions above move the same notes around.
Resolving it nowhere. Because it is symmetrical, Caug can resolve in several directions, but it must resolve somewhere. Pick a destination chord and practise the move. On the piano, the root-position keys C, E, G# show Caug most clearly.
Confusing it with a whole-tone sound. The augmented triad is part of the whole-tone scale, but on its own it is just three notes: C, E, G#. Do not add extra whole-tone notes unless you mean to. On the piano, play the keys C, E, G# slowly and listen for each note of Caug in turn.
Where Caug is used
Caug is not a diatonic triad in any major or minor key, because it is an extended or altered chord, but its base triad belongs to the key of C major, the key of F major, the key of G major. a dominant colour in jazz, where the sharpened 5th adds tension to a V chord. As a dominant-type chord it also points toward F major, the key a perfect fourth above C, which is the tonic it most often resolves to. That is where Caug does its work: not as a home chord, but as a chord that creates movement and then resolves. On the piano, play the keys C, E, G# slowly and listen for each note of Caug in turn.
Because Caug is an extended or altered chord, it appears in progressions as a colour or a dominant rather than as a diatonic staple. Try it in place of the plain C triad in a progression you already know, and listen to how the extra notes change the feel — that substitution is the usual way extended chords enter real music. The Chord Progression Builder lets you try Caug in a progression in any key and hear how it connects to the chords around it. On the piano, the root-position keys C, E, G# show Caug most clearly.
The same chord on other instruments is covered in Caug on guitar, Caug on ukulele, Caug on bass, and the scales that fit over it are the C major scale and the C minor pentatonic scale. Learning Caug on the piano and then checking it on another instrument is one of the best ways to fix the notes — C, E, G# — in your memory, because the notes stay the same while everything else changes.
Practising Caug
A short worked example makes Caug concrete. Play the four-chord progression F – C – Dm – A# in F major, the key Caug most often resolves toward: F – C – Dm – A#. Play each chord for one bar at a slow tempo, and listen to how Caug sounds in that sequence — whether it feels like home, like a lift, or like a chord on its way somewhere else. Then play the same four chords in a different order, starting on Caug itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the piano, Caug is the keys C, E, G#, and the inversions above move the same notes around.
For a second exercise, play Caug and then the chord a fourth above C, back and forth, four times each. That move — a chord and the chord a fourth above it — is the most common resolution in Western music, and it is the move Caug is built for when it acts as a dominant. Finish by playing Caug on its own, slowly, and naming each note out loud as you play it: C, E, G#. Naming the notes while you play them is what turns a shape into knowledge you can use in any key. Test yourself with the Practice Chord Quiz and keep time with the Metronome as the tempo rises. On the piano, the root-position keys C, E, G# show Caug most clearly.
Frequently asked questions
Which fingers do you use for Caug on piano?
In the right hand, start with the thumb on C and one finger per note in order, ending with the little finger on G#. In the left hand, mirror it with the little finger on the low C. Longer fingers take the black keys, so check which notes of Caug are black keys before you settle on a fingering.
Why does Caug sound strange?
Its 5th is sharpened to G#, so the chord is two major 3rds stacked and divides the octave into three equal parts. With no perfect 5th to anchor it, the chord sounds like it floats. On the piano, the keys above put that note under your fingers.
What notes are in Caug?
Caug contains C, E, G#: the root C, the major 3rd E and the augmented 5th G#. The raised 5th is the note that makes it augmented. On the piano, the keys above put that note under your fingers.
Where is Caug used?
As a passing chord between a major chord and the chord a semitone above it, and as an altered dominant in jazz. It is a colour chord, used briefly for lift and surprise. On the piano, the keys above put that note under your fingers.
How do you play Caug on the piano?
In root position, play the keys C, E, G#, with C as the lowest note. That is the basic shape of Caug on the piano. The inversions above put a different note in the bass, and the Chord Inverter shows every inversion of Caug on the keyboard.