This is a rough approximation to the main repeated riff of the song. It's not what's
played on the record (the record has a few banjos and guitars layered), but it sounds 
good if you want to play solo acoustic.

 D (xx0232@1)         Bm7 (x20202@1)              F (133211@1)            Am7 (x02010@1)2-0---------------------------|--------------------------0----|
 ----3-0-------------3---3---3-|----1---1--------1----1-----3--|
 --------2---2-2-----2---2-----|--2-2---2------2------0--------|
 ----------------2-4-----------|3------------------2--2--------|
 ------------------------------|-------------------------------|
 ------------------------------|-------------------------------|

Alternate betweeb playing the chords when you sing, and playing the riff in between 
(during the riff, drag the pick lightly over other strings in the chord for best effect).