Key Of A natural minor...
Key of:    A natural minor   (natural)

        7 Tones in key:               A, B, C, D, E, F, G      (i, iidim, IIII, iv, iv, VI, VII)
        3 Primary Chords:          Am, Dm, Em                (i, iv, v)
        3 Secondary Chords:      C, F, G                         ( III, VI, VII)
        Dominant 7th Chord:      E7                                 (V7)
  Danman says..."Check out the chart"...A natural minor
  Scale Step      Root     3rd    5th   Chord Type
         I         A      C     E   Minor
        II        B      D     F   Diminished
        III        C      E     G   Major
        IV        D      F     A   Minor
        V        E       G     B   Minor
       VI        F      A     C   Major
       VII       G      B     D   Major