[dr_dave]

You nailed it. Indeed it is the key of G. Play around with it using the open G, C and D chords. You’ll probably find where they fit. As you will learn in later lessons of FW, these are the I, IV and V chords in the key of G. Most of this song is built on those chords. The other chords that pop up in this song are the Em and the Am (which are the vi and ii chords in the key of G, respectively). All this will fall out from the chord matrix that you’re learning.