Riff1
|---------------------|------------------------|
|---------------------|------------------------|
|---------------------|------------------------|
|---------------------|------------------------|
|-6/5-5-5-6/5-5-5-3-4-|-6/5-5-5-6/5-5-5-3-4-7--|
|-4/3-3-3-4/3-3-3-1-2-|-4/3-3-3-4/3-3-3-1-2-5--|
Riff 2
|-------------|------------|
|-------------|------------|
|-------------|------------|
|-------------|------------|
|-7-7-7/6-6/7-|-5-5-6/5-3--|
|-5-5-5/4-4/7-|-3-3-4/3-1--|
Riff 3 (hold last note before you start riff 3)
[ Tab from: http://www.guitaretab.com/n/napalm-death/56413.html ]
|-------------------------------------------------------------------|
|-------------------------------------------------------------------|
|-------------------------------------------------------------------|
|-------------------------------------------------------------------|
|-3-2-2-2-3-2-2-2-2-2-3-2-3-4-2-2-4-2-2-2-4-2-2-2-2-2-4-2-4-2-2-2---|
|-1/0-0-0-1/0-0-0-0-0-1/0-1/2-0-0-2/0-0-0-2/0-0-0-0-0-2/0-2/0-0-0---|
. . . . . . . . . . . . . . . .
Riff 4
|---------|
|---------|
|---------|
|---------|
|-6-4-5-3-|
|-4-2-3-1-|
END
Yup, great song :)