C

C Major — the foundation triad — stable, bright, and the reference point every other chord colour is measured against.

The keys
C4C5C6
C – E – G
What's inside C
NoteInterval from rootDegree
CRoot1
EMajor 3rd3
GPerfect 5th5
Inversions
PositionKeys (low → high)
Root positionC4 – E4 – G4
1st inversionE4 – G4 – C5
2nd inversionG4 – C5 – E5
A working voicing

Split the chord between two hands the way working players do — a solid shell low down, the colour tones up top:

HandKeys
Left (shell)C2 – G2
Right (colour)E4 – G4
Where C lives

As the I chord

C → F → G → C

The classic I–IV–V–I motion with this chord as home.

In a ii–V–I

Dm7 → G7 → C

The strongest cadence in harmony, resolving onto this chord.

Put C under your fingers

Hear every voicing, see the keys light up, and drill it in the interactive Chord & Voicing Lab.

Open the Chord & Voicing Lab →
Major in every key
C♯ D E♭ E F F♯ G A♭ A B♭ B