Main riff 1 (higher)
G-|---------------------|---------------------|---------------------|---------------------|
D-|-----------0-4-5-6---|---------------------|---------------~7-5~-|-----9----7h9--------|
A-|-7---5-7-------------|------5-7------------|-0-5-6-7-------------|-5/7---7-------5--6--|
E-|---7---------------0-|----------4--5--6--7-|---------0-----------|---------------------|

        The last bar leading to riff 2 (always switch the last two notes):  A-|-----6--5--|

 Main riff 2 (lower)
G-|---------------------|---------------------|---------------------|---------------------|
D-|---------------------|---------------------|---------------~4-2~-|-----6----4h6--------|
A-|-4---2-4-----6-7-8---|---------------------|---2-3-4-2-----------|-2/4-----------2--3--|
E-|---4---------------9-|------7h9-1--2--3--4-|-3-------------------|---------------------|


?? ??
 Variations (the last two bars - the frist two are always the same):

 Var. Of main riff 1 (v)
G-|---------------------|-----9-7----------------|
D-|---------------~7-5~-|----------0-7-8-9-------|
A-|-0-5-6-7-------------|-5/7---------------5--6-|
E-|---------0-----------|------------------------|

 Var. Of main riff 2 (V)
G-|---------------------|-----6-4----------------|
D-|---------------~4-2~-|------------4-5-6-------|
A-|---2-3-4-2-----------|-2/4---------------2--3-|
E-|-3-------------------|------------------------|


 Another special var. of riff 1 (s)
G-|-----------------4/12|-14--12h14--12--7-8-9-------|
D-|-----------~7-5~-----|----------------------------|
A-|-0-5-6-7-------------|-----------------------5--6-|
E-|---------0-----------|----------------------------|
 Another special var. of riff 1 (S)
G-|---------------------|--------7h9-------------|
D-|-----------------5-5-|------------------------|
A-|-0-5-6-7-------------|7-7-7-7------7h10--5--6-|
E-|---------0-----------|------------------------|