drop-d tuning
here's the main riff :
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-----3-----3------------------------------------------|
--0--3--0--3--0---------------------------------------|
--0--3--0--3--0---------------------------------------|
the change (i guess the chorus):
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-----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 !!!!!"