C chord on piano
C (C major) is a major chord built on C. It has 3 notes, C, E and G, and its formula is 1 3 5.
Notes and intervals of C
From the root upwards, C contains root (C), major 3rd (E) and perfect 5th (G). Those intervals give the chord its colour: the formula 1 3 5 works the same way in every key, so once you know it for C you can build the chord on any note.
| Degree | Interval | Note |
|---|---|---|
| 1 | root | C |
| 3 | major 3rd | E |
| 5 | perfect 5th | G |
How to play C on piano
Find C and play C, E and G together. With the right hand, a common fingering is 1-3-5. With the left hand, reverse it (5-3-1). Keep your wrist level and let the fingers curve, so all 3 keys go down at the same time.
Inversions of C
An inversion keeps the same notes but puts another one in the bass. C has 2 inversions besides root position: 1st inversion (E G C) and 2nd inversion (G C E). Inversions let you move between chords with tiny hand movements, which is how pianists make progressions sound smooth.
Which keys use C?
You find C as a diatonic chord in C major (I), F major (V) and G major (IV). The most common case is C major, where it plays the role of I.
Scales to play over C
To improvise over C, start with C major scale. All of these scales contain every note of the chord: C major scale, C major pentatonic scale, C Lydian mode and C Mixolydian mode. Aim for the chord notes on strong beats and use the other notes to move between them.
About major chords
The major chord is the brightest and most stable sound in tonal music: root, major third and perfect fifth (1 3 5). The major third, four semitones above the root, gives it its open, confident character. It is the basic triad every other chord is measured against, and a song that ends on it sounds like it has come home.
Every style uses it, from folk to metal. In a major key the major chords are I, IV and V, enough for thousands of songs: I IV V I, the I V vi IV pop loop, the 12-bar blues. In a minor key they sit on ♭III, ♭VI and ♭VII, and V is often made major for a stronger cadence.
Play root, third and fifth with fingers 1 3 5 in the right hand and 5 3 1 in the left. Learn both inversions (third in the bass, then fifth in the bass) so you can move between I, IV and V without jumping. A common split: root or octave in the left hand, the full triad in the right.
The classic slip is a minor third played by accident: one fret or one key lower and the mood flips. On guitar, check that the third is not muted under a finger. And a power chord (for example C5) is not a major chord: with no third it is neither major nor minor.
Frequently asked questions
What notes are in the C chord?
C (C major) contains C, E and G. In intervals: root (C), major 3rd (E) and perfect 5th (G).
How do you play C on piano?
Play C, E and G together with the right-hand fingering 1-3-5. You can also play it in 2 inversions, shown on this page.
What scale goes with C?
C major scale fits C best. Other scales that contain all its notes: C major pentatonic scale, C Lydian mode and C Mixolydian mode.
What key is C in?
C belongs to C major (I), F major (V) and G major (IV). In C major it is the I chord.
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