War Pigs by Black Sabbath

Intro
G---------------------------------------------------------------
D------------------------------------------7-5------------------
A-7-7-5-5---5-7-7-7-5h7-7-5-5-5---5---5-5-----------------------
E---------7---------------------7---7---------------------------

"generals gathered in their masses..."
G--------------------------------------
D--------------------------------------
A-5h7-5h7-5h7--------------------------
E-------------------------------------- and so on

next part
G--------------------------------------
D--------------------------------------
A-----5h7---5h7------------------------
E-7777---777--------------------------- palm mute E string

Keep repeating that until...
G--------------------------------------
D--------------------------------------
A-5-7----5-5---5---------------------
E------------7---7-------------------

repeat until...
|---r---r---------------|-------9-------9p7-----|-------9---------7/12-9-7-|----
|---e-5-e---------------|-------------------7h9-|-------------7-9----------|----
|-7-s---s-7-7-5---------|-7-7-7---7-7-7---------|-7-7-7---7-7--------------|----
|---t---t-------7-5-0-3-|-----------------------|--------------------------|----

the song has no new riffs from there on so all these riffs will do for the rezt of the song