Key Of C Major...
 
Key of:    C Major
 
        7 Tones in key:              C,D,E,F,G,A,B        (I, ii, iii, IV, V, vi, vii)
        3 Primary Chords:         C, F, G                     (I, IV, V)
        3 Secondary Chords:     Dm, Em, Am             (ii, iii, vi)
        Dominant 7th chord:      G7                             (V7)
  Danman says..."Check out the chart"...C Major
 

Scale Step	Root	3rd	5th	Chord Type
I	C	E	G	Major
II	D	F	A	Minor
III	E	G	B	Minor
IV	F	A	C	Major
V	G	B	D	Major
VI	A	C	E	Minor
VII	B	D	F	Diminished