Watch the Changing Voices online guitar lesson by Brad Carlton from Chord Studies: Pedal Tones Vol. 1
This progression is another vi-IV in the key of C using Am and F/A. We're working our way through a number of different voicings for these two chords, and as you go through these examples pay attention to what each note in the chords sound like. The first chord is Am, then raising the E to an F to get our F/A chord. Next we'll play our initial Am chord again, but this time with the E note on top. Lastly, we move on to our F/A that has a change in the top voicing as well.