Here is the one and only definitive song from Pink Floyd. Enjoy!!

Intro
play this 8 times
2  2 2  
 3    
  2    

Verse 1
play this twice
2  2 2  2 1  1 1  1 
 3    3    0    0
  2    2    0    0
On verse 3 repeat this
2  2 2  2 4  4 4  4 3   3 3   3 2  2 0  0
 3    3    5    5    2     2     3    3  3 
  2    2    4    4    2     2     2    2  2
                       2     2
Verse 2 and 3 
repeat verse 1  then add this on the end which is the bridge to the chorus play 
2  2
 1  1
  2  2 

Chorus
G                           A
And if the dam breaks open many years too soon
C                    G 
And if there is no room upon the hill
G                       A
And if your head explodes with dark forebodings too 
C                    G       Bm    Em    A
I'll see you on the dark side of the moon