Drop D tuning
4/4
D chord all the way through (Hence that name "One chord song")


                                                      |-----|
e|-----------------------------|----------------------------|
b|-----------------------------|----------------------3-----|
g|-------------------2---------|-------------------2--2-----|
d|---------0---2/4-----4\2-0---|----------0---2/4-----------|
a|----0t2----------------------|----0t2---------------------|
E|--0-----0-0------------------|--0-----0---0---------------|
    |---let ring----------------| |---let ring--------------|
                       ^^^
               Make this slide quick
                                        |----|        |-----|
e|-----------------------------|----------------------------|
b|-----------------------------|----------------------------|
g|-------------------2---------|--2--0----------------------|
d|---------0---2/4-----4\2-0---|--------4-------2p0---0-----|
a|----0t2----------------------|--------------------2-------|
E|--0-----0-0------------------|----0-0-------0-------------|
    |---let ring----------------| |---let ring--------------|

There's the intro. All the rest you can figure out by listening to it. It's just 
variations of notes in a D chord. You gotta play this song with feel though.