This is the main riff through the whole song:
G|----------5-3-----------|
D|---1-34-5-----5-3-56-5-3| x40
A|-3----------------------|
E|------------------------|
A lot of the times it will play like this: (with the 1 starting it off)
G|----------5-3-----------|----------5-3-----------|
D|---1-34-5-----5-3-56-5-3|---1-34-5-----5-3-56-5-3|
A|-3----------------------|13----------------------|
E|------------------------|------------------------|
And sometimes like this: (with the slide)
G|----------5-3-----------|----------5-3-----------|
D|---1-34-5-----5-3-56-5-3\---1-34-5-----5-3-56-5-3|
A|-3----------------------|\3----------------------|
E|------------------------|------------------------|
And a couple of times it did this: (near the end)
G|----------5-3-----------|-53------------5-3----------|
D|---1-34-5-----5-3-56-5-3|---53---1-34-5----5-3-56-5-3|
A|-3----------------------|-----53---------------------|
E|------------------------|----------------------------|
That's pretty much all. Sorry I didn't get it exact at all parts,
so you're going to have to figure that out by yourself. But the
basic tab that you can stick to is the first one up there, it still
sounds good, even without the fills.