Key Of G Major...
Key of:    G Major
        7 Tones in key:              G, A, B, C, D, E, F#          (I, ii, iii, IV, V, vi, vii)
        3 Primary Chords:         G, C, D                              (I, IV, V)
        3 Secondary Chords:     Am, Bm, Em                      (ii, iii, vi)
        Dominant 7th chord:      D7                                      (V7)
  Danman says..."Check out the chart"...G Major
  Scale Step      Root     3rd    5th   Chord Type
         I         G      B     D   Major
        II        A      C     E   Minor
        III        B      D     F#   Minor
        IV        C      E     G   Major
        V        D      F#     A   Major
       VI        E      G     B   Minor
       VII       F#      A     C#   Diminished