Why

Intro:

Guitar part 1
e|------0---0----0---0---|------0---0----0--0------  
B|------7---8----10--12--|------3---5----5--7------  
G|-----------------------|-------------------------  
D|-----------------------|-------------------------  
A|--7-7---7---10---------|--3-3---3---5------------  
E|-----------------------|-------------------------  

2nd guitar
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e|-----------------------|-------------------------  
B|-----------------------|-------------------------  
G|-----------------------|-------------------------  
D|-----------------------|-------------------------  
A|-7-x-7-x-x-7-x-7-x-x-7-|-7-x-7-x-x-7-7-x-5-x-x-5-  
E|-----------------------|-------------------------  

Now the other part: You need to use the numbers in ( ) to see what order it comes in
e|---------------------------------------------------------------------  
B|---------------------------------------------------10-12-13-13p10-12-  
G|-------------------12-11---------------------------------------------  
D|-14-12-14---12-14--------14-p12-14-/16\14-/17\14---------------------  
A|---------------------------------------------------------------------  
E|---------------------------------------------------------------------  

e|------------------------------------------------------  
B|-/17-----/15----13---12-------------------------------  
G|-----14------12---------------------------------------  
D|-------------------------14---------------------------  
A|------------------------------12--14--15--14-/-12-----  
E|------------------------------------------------------  

(2)
e|--------15-/19--------15--17--15--14--15----------15-/21b-r-b-r-  
B|-15--17--------15--17----------------------15--17---------------  
G|----------------------------------------------------------------  
D|----------------------------------------------------------------  
A|----------------------------------------------------------------  
E|----------------------------------------------------------------  

e|-----------------------------------------------------------------------   
B|-----------------------------------------------------------------------   
G|---12--14--14/16-16--12--14/16-14-14--12-14-14/16-16-17-16-14/12-14-14-   
D|-14----------------14---------------14----------------------------------  
A|-----------------------------------------------------------------------   
E|-----------------------------------------------------------------------   

e|------------------------  
B|------------------------  
G|------------------------  
D|------------------------  
A|------------------------  
E|--0--0--3--0--5--0--6-7-