Guitar Chords in the Key of C Major
The chord formula for any Major key is major, minor, minor, major, major, minor, diminished.
The chords in the key of C major are C major, D minor, E minor, F major, G major, A minor, and B diminished.
A common way to number these chords is by Roman numerals: I, ii, iii, IV, V, vi, vii. Numerals that represent a major chord are usually capitalized, and minor and diminished chords are lower case.
Related Natural Minor Key