all along the watch tower 
 
The intro wasn't tabbed on any of the tabs, so, 
e|------------------------------| 
b|--4-4--5-5-5-5--4-4--2-2-2-2--| 
g|--4-4--6-6-6-6--4-4--2-2-2-2--| 
d|--4-4--6-6-6-6--4-4--2-2-2-2--|x2 
a|--2-2--4-4-4-4--2-2--0-0-0-0--| 
e|------------------------------| 
 
by the way, these chords are:  
  B   C#m   B   A