The Seers Tower by Sufjan Stevens

This song is played on the piano, but transposes to the guitar easily. There is really
one main line in the song. So yeah, standard tuning with a D G A structure and it leaves
lot of openings for you to add your own little things to it. He adds a little something 
and there and there's no sense writing it all down, so you figure it out.

    Main riff:
e|---------------------|
B|-3----------1---(3)--|
G|-----2--0------2-----|
D|-0-------------------|
A|---------------0-----|
E|--------3------------|

Sometimes he adds on this little
riff to the end of the main riff:
e|---1-0-|
B|-1-----|
G|-------|
D|-------|
A|-------|
E|-------|

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