Main Riff:
E|-----------|
B|-----------|
G|10\8--8--5-| This riff is played in the beginning and in the end, and in D|10\8--8--5-|between.
D|8-\6--6--3-|
A|-----------|
                                                                              
Main riff add:
E|--------|
B|6/8/11--|
G|--------| Sometimes this thing comes in, followed by the main riff.
D|3/5/8---|
A|--------|
E|--------|
              
Riff 2:
E|--------11--------11--11--11--11-----------|
B|-9--10--8---------9---8---9---8------------|
G|-8--8---8---------9---8---9---8---7--5--15-| This is the part when he
D|-7--8--------------------------------------| sings "Under a loop of
A|----------------------------------5--3--13-| stars..".  You could say it's
E|-------------------------------------------| the chorus of the song.
                                                           
Riff 3:
E|----------------------|
B|----------------6/8/11|
G|----10------6-5-------| This is the "By the pebbles of the highway.."
D|10------6-5-----3/5/8-| part.
A|----------------------|
E|----------------------|