This is the part the bass sings in the choir, and sounds more correct to me than the 
versions I have seen.

Standard Tuning

6/8 time - each note is an eighth note
e|----------------------------------------------|
B|----------------------------------------------|
G|----------------------------------------------|
D|----------------------------------------------|
A|--3--------------3--4--------------4----------|
E|-----5--1--1--5--------6--2--2--6-------------|


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

Repeat throughout entire song.