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|-------|