Chords in the key of C major
The chord chart below lists all the common traids 
and four note extended chords belonging to the key 
of C major. Roman numerals indicate each chords 
position relative to the scale.

C major scale notes: C D E F G A B C
Major key chord sequence: Maj min min Maj Maj min dim
I	ii	iii	IV	V	vi	vii
Cmaj	Dmin	Emin	Fmaj	Gmaj	Amin	Bdim
Cmaj7	Dmin7	Emin7	Fmaj7	G7	Amin7	Bm7b5
Common chord progressions in C major
I - IV - V	C - F - G
I - vi - IV - V	C - Am - F - G
ii - V - I	Dm7 - G7 - Cmaj7