"1st Part"
E----------------------------------|
B------7--------7---------7--------|
G---------8-------8----------------|
D----------------------------------|
A---6---------6--------6-----------|
E----------------------------------|
[ Tab from: http://www.guitaretab.com/w/weekend/360941.html ]
"2nd Part"
E---------------------------------------|
B-------4-----------4----------4--------|
G-----------4-----------4---------------|
D---------------------------------------|
A---------------------------------------|
E----4------------4----------4----------|
"3rd Part" (Repeat, then Jump back to "1st Part")
E------------------------------------------------|
B---------6------------6-----------------6-------|
G-------------6------------6---------------------|
D------------------------------------------------|
A------------------------------------------------|
E----6------------6------------------6-----------|
Just Keep Repeating it...
Good Luck XD