Hi!  I was wondering - how often are chords in a songs taken strictly from the key that it's in?  For example:

http://www.youtube.com/watch?v=O49gt5f0 … mp;index=5

You have to scroll to about 40 seconds in to get to the song (ignore the propaganda).

I hear D-C-A and then G-C-A.  But I hear them all as major, and one of the chords would have to be minor (I think it's in C major?).

An answer to this question would be greatly appreciated!  Thx!