Decided to tab this, as I couldn't find any online. It's not complete, just the main 
riff and chords,
but hopefully it helps :)

Main Riff:

E|----------------------------------------------------------------------------------|
B|----------------------------------------------------------------------------------|
G|----------------------------------------------------------------------------------|
D|------15--15--13--15--16--15--13--15--15--13----------13--15--13------13----------|
A|--13------------------------------------------16--16--------------16------15--15--|
E|----------------------------------------------------------------------------------|

E|----------------------------------------------------------------------------------|
B|----------------------------------------------------------------------------------|
G|----------------------------------------------------------------------------------|
D|------15--15--13--15--16--15--13--15--15--13----------13--15--13--13--------------|
A|--13------------------------------------------16--16------------------13--12--13--|
E|----------------------------------------------------------------------------------|

My friends I stand before you...

E|-----------------|
B|-----------------|
G|-----------8-----|
D|--8--3--6--8--3--|
A|--8--3--6--6--3--|
E|--6--1--4-----1--|

He don't deserve no mercy...

E|--------------------------------------------------|
B|--------------------------------------------------|
G|-----6-----8--------------------------------------|
D|--8--6--6--8--3--8--6--4--3--4--3--4--3--4--3--4--|
A|--8--4--6--6--3--8--6--4--3--4--3--4--3--4--3--4--|
E|--6-----4-----1--6--4--2--1--2--1--2--1--2--1--2--|

Keelhaul, that filthy landlubber, send him down to the depths below..

E|-----------------------------------|
B|-----------------------------------|
G|-----------8--------6--------------|
D|--8--4--6--8--8--4--6--6--8--7--8--|
A|--8--4--6--6--8--4--4--6--8--7--8--|
E|--6--2--4-----6--2-----4--6--5--6--|

MAIN RIFF AGAIN

I will not say what he has done..

E|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|-----6-----8--------6-----8--------------------------------------|
D|--8--6--6--8--3--8--6--6--8--3--8--6--4--3--4--3--4--3--4--3--4--|
A|--8--4--6--6--3--8--4--6--6--3--8--6--4--3--4--3--4--3--4--3--4--|
E|--6-----4-----1--6-----4-----1--6--4--2--1--2--1--2--1--2--1--2--|

Keelhaul, that filthy landlubber, send him down to the depths below..

E|-----------------------------------|
B|-----------------------------------|
G|-----------8--------6--------------|
D|--8--4--6--8--8--4--6--6--8--7--8--|
A|--8--4--6--6--8--4--4--6--8--7--8--|
E|--6--2--4-----6--2-----4--6--5--6--|

MAIN RIFF AGAIN

We'll tie that scoundrel to a rope, And throw him overboard

E|-----------------------------------------|
B|-----------------------------------------|
G|-----------------------------------------|
D|--8--6--4--3--4--3--4--3--4--3--4--3--4--|
A|--8--6--4--3--4--3--4--3--4--3--4--3--4--|
E|--6--4--2--1--2--1--2--1--2--1--2--1--2--|

Keelhaul, that filthy landlubber, send him down to the depths below..

E|-----------------------------------|
B|-----------------------------------|
G|-----------8--------6--------------|
D|--8--4--6--8--8--4--6--6--8--7--8--|
A|--8--4--6--6--8--4--4--6--8--7--8--|
E|--6--2--4-----6--2-----4--6--5--6--|

                                                        http://www.guitartabcreator.com