drop-d tuning

 here's the main riff :

   ------------------------------------------------------|
   ------------------------------------------------------|
   ------------------------------------------------------|
   -----3-----3------------------------------------------|
   --0--3--0--3--0---------------------------------------|
   --0--3--0--3--0---------------------------------------|

the change (i guess the chorus):

   ------------------------------------------------------|
   ------------------------------------------------------|
   ------------------------------------------------------|
   -----3-----3--1---1-----------------------------------|
   --0--3--0--3--1---1-0---------------------------------|
   --0--3--0--3--1---1-0---------------------------------|
      this is the part where Al screams "Filth...Pig !!!!!"