The other bass tab has the main (intro) riff perfect, but is missing the
other parts. This is what I play (no idea if its right. The first part is
copied from Anthony Guidotti (the other tab). Thanks and credit to him.

============================================================

Pretty much this the whole song, but sometimes it varies
G|---------------------------------------|
D|--10\----6-6-3/5--6-6-3/5--3-3---3/5/10|
A|------3------------------------6-------|
E|---------------------------------------|

Variation 1
G|---------------------------------------|
D|10-10\---6-6-3/5--8-8-3/5--3-3---3/5/10|
A|------3------------------------6-------|
E|---------------------------------------|

Variation 2
G|---------------------------------------|
D|-------------3/5--6-6-3/5--3-3---3/5/10|
A|-3---3--6-6--------------------6-------|
E|---------------------------------------|

Variation 3
G|---------------------------------------|
D|-------------3/5--8-8-3/5--3-3---3/5/10|
A|-3---3--6-6--------------------6-------|
E|---------------------------------------|

Variation 4

=========================================================

For the middle part ("I guess I am a scout, So I should find a way
out..."), I just play the bass note of the guitar chords:
G|---------------------------------------|
D|----------------------------5----------|
A|-3-----------------6-------------------|
E|----------4----------------------------|

And for the last part, I'm pretty sure he plays variations on this:

G|---------------------------------------|---------------------------------------|
D|-10-8-10-12-10-10----8-6-5-6-8-6-5-6---|-8---8---6-5-3------5---5---3-5-1------|
A|---------------------------------------|---------------------------------------|
E|---------------------------------------|---------------------------------------|

Not sure if it is right, but it sounds okay. Hope that helps.