Gadd2 is x320x3 (you don't have to mute the A string   
if you can't). Basically you want to keep the D5       
shape (x3200x) and swing around that.                  
                                                       
D5                                                     
  You sit there in your shirt and tie                  You spite the ways of our hallowed land                  
    Gadd2     D5                                         And ignore the plight of our people
    Boldly dictating                                   While you grease the stranger's outstretched hand                                                               
D5                                                       And shout that all are equal
  A crooked smile while you fed us lies                 
               Gadd2             D5                    There'll be bitter cries for your deeds and lies     
    You didn't trust your own persuading                 When Wyrd sounds the horn
                                                       And the Norns will glide through English sky
You sought to slay and to keep at bay                    And you'll reap an England scorned
  The few good men that warned                              
While the dawn is nigh look to the sky                 Fall-de-di de-riddle-aye-di
  Beware of an England scorned                           Fall-de riddle-aye-ay    
                                                       You were bought with coin and you played your part
Fall-de-di de-riddle-aye-di                              And you'll live to rue the day
  Fall-de riddle-aye-ay                                    
You were bought with coin and you played your part     Tell me, fall-de-da de-riddle-aye-di
  And you'll live to rue the day                         Hark to the sounded horn
                                                       When freedom cries fill English skies 
                                                         You'll wish you'd never been born  

                                                       Then repeat the last two verses

The melody is A A | A G F# A | A B C C A | A A | A G F# A | G G F# A
Which you can play something like this (if you want, no pressure)

Fal the rile the riddle eye digh // Hark to the sounded horn
------------------------------------------------------------ 
-3------3-------33----------3---------3--3--3---3-3-----3--- 
-2------2-------22----------2---------0--0--0---0-0-----2--- 
-0------0-------00----------0---------0--0--0---0-0-----0--- 
-0------0-------00----------0-------0h2--2--2---3-3-----0--- 
--------------------3---2-------------3--2--3---3-3--------- 
Then repeat the first bit (up to the 0h2)
And then the last part is basically just	
G -> D/F# -> D/A                          
The violin is playing something a little different instead of the
B and C there, it comes down from a higher note instead of rising.