Wow..timely. I was just playing around with my acoustic version of Sundown the last half hour. Easy song. The main chord is a D5 like this- The other two chords are A and D. Full strum on the D5 chord emphasis on the 1,2 and 3d string on the upstroke to add the chime. Freddy, you lucky dawg you. I've never seen him but always played a few of his songs. Have a great time!