March of the Pigs:
Riff 1:
---------------|---------------------|
---------------|---------------------|
-7-7-7-7-------|-7-7-7-7-------------| x4
-7-7-7-7-5-3---|-7-7-7-7-5-3-2-3-5-6-|
-5-5-5-5-5-3-3-|-5-5-5-5-5-3-2-3-5-6-|
-------------4-|---------------------|
|__________x3__|

Riff 2: A B A B A B A
------------------------------------------------------------------|
------------------------------------------------------------------| A
-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5-5----------------------------------|
----------------------------------4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-4-|

------------------------------------------------------------------|
------------------------------------------------------------------| B
------------------------------------------------------------------|
-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3-3--1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-|

Riff 3: piano
-----------------|
-3---5-------5-7-|
-3---5-----5---7-|
-3---5---5-----7-|
-----------------|
-----------------|

Riff 1 (x6 instead of x4)

Riff 2

Riff 4: piano
-------------------------------------------------------------------------|
-3---5-------5-7-----------5-----5-7---3---5---7----------------------13-|
-3---5-----5---7-----3-----5---5---7---3---5---7-------------------10----|
-3---5---5-----7---3-3-3\3-5-5-----7---3---5---7----------------10-------|
-------------------------1-------------1---3---5---5---7------9----------|
---------------------------------------------------6---8---10------------|