The song has an easy fingerpicking pattern that you can pick up from listening to the 
song (he mostly picks the lower strings of the chords).  On the Am7 chord during the 
chorus, he alternates on and off of the B-string first fret (relative to capo).

Capo 3rd Fret

Chords:
G (320003@1)   320001
C(#7) 33200x
Am7   x0201x

G (320003@1)                   CMary (x32010@1)Anne, do you remember
                Am7the (x02010@1)tree by the river
                  Gwhen (320003@1)we were seventeen?

G (320003@1)                              CDark (x32010@1)canyon wall, the call and the answer
                    Am7and (x02010@1)the mare in the pasture
                           Gpitch (320003@1)black and baring its teeth.

I recall the sun in our faces,
stuck and leaning on braces,
and being strangers to change.

Radio and the bones we found frozen,
and all the thorns and the roses
beneath your window pane.

Am7 (x02010@1)                 GNow (320003@1)I'm asleep in a car, I mean the world
     Am7to (x02010@1)a potty-mouth girl,
                           Ga (320003@1)pretty pair of blue-eyed birds.

Am7 (x02010@1)                    GTime (320003@1)isn't kind or unkind, you liked to say.
     Am7But (x02010@1)I wonder to who
                         Gwhat (320003@1)it is you're saying today.

Now I'm asleep in a car, I mean the world
to a potty-mouth girl,
a pretty pair of blue-eyed birds.

Time isn't kind or unkind, you liked to say.
But I wonder to who
what it is you're saying today.

Mary Anne, do you remember
the tree by the river
when we were seventeen?

Dark canyon road, I was coy in the half-moon;
happy just to be with you,
and you were happy for me.