The C6 ukulele chord contains C, E, G, A. Its first ukulele voicing is the open position: G string muted; C string open; E string open; A string open. As a major 6th chord it has a distinct job in a progression, and this page explains that job alongside the fingerings, the notes and the practice steps that make it stick.
What notes are in the C6 chord?
The C6 chord is a major 6th chord, and its notes are fixed: C, E, G, A. 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 C6 at a glance. On the ukulele, the open position voicing is the place to hear it in C6.
| Note | Interval |
|---|---|
| C | Root |
| E | 3 |
| G | 5 |
| A | 6 |
The root is C, the note the chord is named after and the note your ear hears as home. Above it, the intervals in C6 are 3, 5, 6. That combination is what makes C6 sound the way it does: the intervals decide the colour, and the root decides the pitch. On the ukulele, the notes appear in the order the fingering dictates, but the set of notes never changes.
C6 sounds mellow and open, a major chord with an extra note that adds warmth without adding tension. That character comes straight from the intervals above, not from the instrument: the same notes on piano, guitar or ukulele carry the same colour, even though the voicing changes. On the ukulele, the open position of C6 puts those notes under your fingers in the order the fingering lists them.
Comparing C6 with its closest relatives helps to fix it in your ear. In short, 6th against major 7th: C6 adds the 6th A; the major 7th chord adds B instead. The 6th sounds warmer and more old-fashioned; the 7th sounds dreamier. Play both chords slowly, one after the other, and notice which note moves. Naming that note out loud while you play is the fastest way to learn the difference. On the ukulele, the open position voicing is the place to hear it in C6.
How to play C6 on ukulele
On the ukulele, C6 has 3 voicings in the data below, and each one uses the same notes — C, E, G, A — in a different place on the neck. The first voicing below is the one to learn first, and the alternatives cover the rest of the neck. Finger numbers below use 1 for the index finger, 2 for the middle finger, 3 for the ring finger and 4 for the little finger, and x means the string is not played.
The open position puts C6 in open position: G string muted; C string open; E string open; A string open. The challenge here is the muted string: 1 string is marked x, and it needs to stay silent. Let the edge of a fretting finger rest lightly on it — muting by touch, not by pressing. Strum or pluck it slowly first and check that every note in C6 — C, E, G, A — sounds, with no buzz and no accidental open string.
The barre chord puts C6 in around fret 5: G string at fret 5 (index finger); C string at fret 7 (middle finger); E string at fret 5 (index finger); A string at fret 7 (ring finger). It barres across strings 1 to 3 at fret 5 with the index finger. The barre is the hard part: the index finger must press every string from 1 to 3 evenly at fret 5, so roll it slightly onto its bony side and keep it close to the fret wire. If the barre buzzes, move it a fraction closer to the fret and press from the arm, not the thumb alone. Strum or pluck it slowly first and check that every note in C6 — C, E, G, A — sounds, with no buzz and no accidental open string.
For the movable voicing, C6 sits in around fret 4: G string at fret 5 (middle finger); C string at fret 4 (index finger); E string open; A string open. This voicing is comfortable because the fretted notes sit close together, from fret 4 to fret 5, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in C6 — C, E, G, A — sounds, with no buzz and no accidental open string.
Choosing between the voicings of C6 is a musical decision, not a right-or-wrong one. The open or low-position voicing rings the most and suits strumming, while a barre or movable voicing lets you slide C6 up the neck to any key without changing the shape. When you change chords, pick the voicing of C6 that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into C6 from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the ukulele, the open position voicing is the place to hear it in C6.
A short practice routine for C6 on the ukulele: play the first voicing four times slowly, checking each note, then change to it from the chord a fourth above C and back, four times, at a slow tempo. Then play the second voicing the same way. If a note buzzes, stop and fix the finger placement rather than playing through the buzz — clean notes at a slow tempo become clean notes at full tempo, while buzzes practised fast become habits. Use the Ukulele Chord Finder to see the diagram for C6 while you practise, and the Chord Finder to compare it with the same chord on other instruments.
Common mistakes
These are the mistakes that most often make C6 sound wrong on the ukulele, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Voicing it too low. The 6th sits close to the 5th and 7th in low octaves and can sound muddy. Spread the notes out. On the ukulele, the open position of C6 puts those notes under your fingers in the order the fingering lists them.
Pressing too hard on the nylon strings. Ukulele strings need far less pressure than guitar strings, and pressing hard on C6 pulls the notes sharp and tires the hand. Use the lightest touch that gives a clean note, and keep your fingers close to the frets. On the ukulele, the open position of C6 puts those notes under your fingers in the order the fingering lists them.
Confusing the 6th with the 7th. The added note here is A, a whole step above the 5th, not the 7th. Play B and you have a different chord. On the ukulele, the open position voicing is the place to hear it in C6.
Burying the 6th. A is the colour note of this chord. If it is muted or too quiet, the chord is just a major triad and the vintage warmth is gone. On the ukulele, the open position voicing is the place to hear it in C6.
Where C6 is used
C6 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. the I or IV chord in major keys, giving a progression a vintage, relaxed feel. 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 C6 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the ukulele, start with the first voicing above and listen for the notes C, E, G, A in C6.
Because C6 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 C6 in a progression in any key and hear how it connects to the chords around it. On the ukulele, start with the first voicing above and listen for the notes C, E, G, A in C6.
The same chord on other instruments is covered in C6 on guitar, C6 on piano, C6 on bass, and the scales that fit over it are the C major scale and the C minor pentatonic scale. Learning C6 on the ukulele and then checking it on another instrument is one of the best ways to fix the notes — C, E, G, A — in your memory, because the notes stay the same while everything else changes.
Practising C6
A short worked example makes C6 concrete. Play the four-chord progression F – C – Dm – A# in F major, the key C6 most often resolves toward: F – C – Dm – A#. Play each chord for one bar at a slow tempo, and listen to how C6 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 C6 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the ukulele, the open position of C6 puts those notes under your fingers in the order the fingering lists them.
For a second exercise, play C6 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 C6 is built for when it acts as a dominant. Finish by playing C6 on its own, slowly, and naming each note out loud as you play it: C, E, G, A. 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 ukulele, the open position voicing is the place to hear it in C6.
Frequently asked questions
Is C6 hard to play on the ukulele?
It depends on the voicing. The first voicing of C6 on the ukulele is the easiest starting point, and the movable voicings further up the neck are harder because they need a barre or a wider stretch. Practise the first voicing cleanly at a slow tempo before you try the others, and the harder shapes will come more easily.
What is the easiest voicing of C6 on the ukulele?
The open position is the easiest voicing listed for C6 on the ukulele: frets x–0–0–0, fingers 0–0–0–0. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
What does the 6 mean in C6?
The 6 means the 6th note of the scale, A, is added to the major triad. C6 contains C, E, G, A: root, major 3rd, perfect 5th and the added 6th. On the ukulele, the first voicing above shows where that note sits.
Is C6 a major chord?
Yes. C6 is a major triad (C, E, G) with the 6th A added. It sounds major, warm and a little nostalgic. On the ukulele, the first voicing above shows where that note sits.
What is the difference between C6 and Cmaj7?
C6 adds the 6th A; Cmaj7 adds the major 7th B. The 6th chord sounds warmer and more old-fashioned, the maj7 sounds dreamier and more modern. On the ukulele, the first voicing above shows where that note sits.