The C11 mandolin chord contains C, E, G, A#, D, F. Its first mandolin voicing is a barre chord at fret 3: G string at fret 3 (index finger); D string at fret 3 (index finger); A string at fret 3 (index finger); E string open. As a dominant 11th 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 C11 chord?
The C11 chord is a dominant 11th chord, and its notes are fixed: C, E, G, A#, D, F. 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 C11 at a glance. On the mandolin, start with the first voicing above and listen for the notes C, E, G, A#, D, F in C11.
| Note | Interval |
|---|---|
| C | Root |
| E | 3 |
| G | 5 |
| A# | b7 |
| D | 9 |
| F | 11 |
The root is C, the note the chord is named after and the note your ear hears as home. Above it, the intervals in C11 are 3, 5, b7, 9, 11. Those intervals are the fingerprint of the dominant 11th quality — any chord with the same interval pattern, on any root, is the same kind of chord. On the mandolin, the notes appear in the order the fingering dictates, but the set of notes never changes.
C11 sounds open and modern, the sound of jazz and fusion dominants. 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 mandolin, start with the first voicing above and listen for the notes C, E, G, A#, D, F in C11.
Comparing C11 with its closest relatives helps to fix it in your ear. In short, 11th against 9th: C11 adds the 11th F on top of the 9th D. In practice the 3rd is often left out of the voicing, because the 11th clashes with it. Hearing the comparison matters more than reading it: play C11, then play the chord it is compared with above, and let your ear find the note that changed. On the mandolin, the barre chord of C11 puts those notes under your fingers in the order the fingering lists them.
How to play C11 on mandolin
On the mandolin, C11 has 3 voicings in the data below, and each one uses the same notes — C, E, G, A#, D, F — in a different place on the neck. There are 3 voicings listed for C11 on the mandolin; learn the first, then add the others as you need them. 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.
Another way to play C11 is the barre chord, in around fret 1: G string at fret 3 (index finger); D string at fret 3 (index finger); A string at fret 3 (index finger); E string open. It barres across strings 1 to 3 at fret 3 with the index finger. The barre is the hard part: the index finger must press every string from 1 to 3 evenly at fret 3, 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 C11 — C, E, G, A#, D, F — sounds, with no buzz and no accidental open string.
For the movable voicing, C11 sits in around fret 5: G string at fret 5 (index finger); D string at fret 8 (middle finger); A string at fret 8 (middle finger); E string open. The stretch is the challenge: the fretted notes span from fret 5 to fret 8, so keep your thumb low behind the neck and let your fingers reach rather than squeezing the neck. Strum or pluck it slowly first and check that every note in C11 — C, E, G, A#, D, F — sounds, with no buzz and no accidental open string.
For the open position, C11 sits in open position: G string at fret 3 (ring finger); D string at fret 2 (middle finger); A string at fret 3 (little finger); E string at fret 1 (index finger). This voicing is comfortable because the fretted notes sit close together, from fret 1 to fret 3, so your hand stays relaxed and every note can ring. Strum or pluck it slowly first and check that every note in C11 — C, E, G, A#, D, F — sounds, with no buzz and no accidental open string.
Choosing between the voicings of C11 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 C11 up the neck to any key without changing the shape. When you change chords, pick the voicing of C11 that sits closest to the chord before it — shorter moves between shapes mean faster, cleaner changes. Practise the change into C11 from the chord that comes before it in your song, not the chord on its own, because the move is the skill. On the mandolin, the barre chord of C11 puts those notes under your fingers in the order the fingering lists them.
A short practice routine for C11 on the mandolin: 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 Mandolin Chord Finder to see the diagram for C11 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 C11 sound wrong on the mandolin, and each one has a concrete fix. Work through them one at a time rather than trying to fix everything at once.
Playing the 3rd and 11th together. E and F clash badly in the same octave. In an 11th chord the 3rd is usually omitted or placed far from the 11th. On the mandolin, start with the first voicing above and listen for the notes C, E, G, A#, D, F in C11.
Crowding six notes. Six notes are too many for most voicings. Drop the 5th and often the 3rd too, keeping root, 7th, 9th and 11th. On the mandolin, the barre chord of C11 puts those notes under your fingers in the order the fingering lists them.
Playing the 11th too low. F low down sounds muddy against the root. Keep it high in the voicing. On the mandolin, start with the first voicing above and listen for the notes C, E, G, A#, D, F in C11.
Using it as a tonic. C11 is a dominant chord. It wants to resolve to the tonic. On the mandolin, the barre chord of C11 puts those notes under your fingers in the order the fingering lists them.
Where C11 is used
C11 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 11th replaces the 3rd in the voicing to avoid a clash. 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 C11 does its work: not as a home chord, but as a chord that creates movement and then resolves. On the mandolin, the barre chord voicing is the place to hear it in C11.
Because C11 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 C11 in a progression in any key and hear how it connects to the chords around it. On the mandolin, the barre chord of C11 puts those notes under your fingers in the order the fingering lists them.
The same chord on other instruments is covered in C11 on guitar, C11 on piano, C11 on ukulele, and the scales that fit over it are the C major scale and the C minor pentatonic scale. Learning C11 on the mandolin and then checking it on another instrument is one of the best ways to fix the notes — C, E, G, A#, D, F — in your memory, because the notes stay the same while everything else changes.
Practising C11
A short worked example makes C11 concrete. Play the four-chord progression F – C – Dm – A# in F major, the key C11 most often resolves toward: F – C – Dm – A#. Play each chord for one bar at a slow tempo, and listen to how C11 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 C11 itself, and notice how its character changes when it opens the progression instead of sitting inside it. On the mandolin, the barre chord voicing is the place to hear it in C11.
For a second exercise, play C11 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 C11 is built for when it acts as a dominant. Finish by playing C11 on its own, slowly, and naming each note out loud as you play it: C, E, G, A#, D, F. 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 mandolin, the barre chord voicing is the place to hear it in C11.
Frequently asked questions
How do you play C11 on the mandolin?
The first voicing is the barre chord: frets 3–3–3–0, fingers 1–1–1–0, on the mandolin. That voicing uses the notes C, E, G, A#, D, F, and it is the one to learn first. The page above lists more voicings for C11, so you can choose the shape nearest the chords around it.
Is C11 hard to play on the mandolin?
It depends on the voicing. The first voicing of C11 on the mandolin 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 C11 on the mandolin?
The barre chord is the easiest voicing listed for C11 on the mandolin: frets 3–3–3–0, fingers 1–1–1–0. Learn that shape first, get every note ringing cleanly, and only then move on to the alternative voicings further up the neck.
What notes are in C11?
C11 contains C, E, G, A#, D, F: root, major 3rd, perfect 5th, flattened 7th, 9th and 11th. In practice the 3rd is often omitted from the voicing, because it clashes with the 11th. On the mandolin, check the first voicing above for that note.
Why is the 3rd often left out of C11?
The 11th F is a semitone above the major 3rd E, so the two notes clash in the same octave. Leaving the 3rd out keeps the chord open and lets the 11th colour it. On the mandolin, check the first voicing above for that note.