For this song, it's recommended to use a 5-string bass.
However, if you have a 4 string bass like i do, tune it 2 and a half steps down, to 
(BEAD) and finger/pick gently.

legend:
/ - slide up to note
\ - slide down from note
n - let the note ring

Main theme (Verse):
D|-------------|------------|
A|*------------|-----------*|
E|*------------|-----------*|
B|--5--3--5n\--|-----1--1n--|

0:28
rest.

0:42
Main theme again.

0:50
Main theme variation.
D|--------------|------------|
A|*----7--------|------3----*|
E|*---7---------|-----3-----*|
B|--5----3--5n\-|---1----1n--|

1:40
Chorus
D|--------------|--------------|---------|-------------|
A|*-------------|--------------|---------|------------*|  these are 17,
E|*-------------|--------------|---------|------------*|  not 1 and 7!
B|-5-5/17171717\|5-55/17171717\|1-1--111-|0-0-3-333----|

2:08
Main theme variation again.

2:51
rest

3:05                          3:13
D|--------------|------------|--------------|--------------------|
A|-----7--------|------3-----|-----7--------|----3---------------|
E|----7---------|-----3------|----7---------|---3----------------|
B|--5----3--5n\-|---1----1n\3|--5----3--5n\-|-1----1n\33333333\--|

3:20
Chorus

4:39
I call it the 'bass solo' section, its the same as chorus, except that you kick in some 
distortion here.
D|--------------|--------------|---------|-------------|
A|*-------------|--------------|---------|------------*|  these are 17,
E|*-------------|--------------|---------|------------*|  not 1 and 7!
B|-5-5/17171717\|5-55/17171717\|1-1--111-|0-0-3-333----|

Continue this untill the end of the song.

Thats it, hope you enjoy!