ff 1 (Main Riff)

[e:---------------------------------------------------|]
[b:---------------------------------------------------|]
[g:---------------------------------------------------|]
[d:---------4--------4-2-0----------------------------|]
[a:-2-2-2-2----2-2-------------------4--------4-0-----|]
[e:---------------------------3-3-3-3-----3-3---------|]

Riff 2 (Before Bass Bridge)

[e:-----------------------------------------------------|]
[b:-----------------------------------------------------|]
[g:-----------------------------------------------------|]
[d:---------4--------4-2-0------------------------------|]
[a:-2-2-2-2------2-2-------------------5--------4-4-0-0-|]
[e:---------------------------3-3-3-3-------3-3---------|]

Riff 3 (After Bass Bridge)

[e:----------------------------------------|]
[b:----------------------------------------|]
[g:----------------------------------------|]
[d:---------4p2-0--------------------------|]
[a:-2-2-2-2------------------4---------4-0-|]
[e:------------------3-3-3-3-----3-3-3-----|]

Riff 4 (End Riff)

[e:-----------------------------------------------|]
[b:-----------------------------------------------|]
[g:-----------------------------------------------|]
[d:---------4--------4-2-0------------------------|]
[a:-2-2-2-2-----2-2------------------4------4---0-|]
[e:-------------------------3-3-3-3-----3-3-------|]



Structure

Riff 1 - 7 times
Riff 2
Riff 3
Riff 4 - as many times as needed