RIFF A: (Lotsa Distortion/Let it ring)
E|--------------------------------------------------------------------|
B|--------------------------------------------------------------------|
G|--------------------------------------------------------------------|
D|-----9---9---9-------10-------7-------9---9---9-------12-------11---|
A|---9---9---9---9---10--10---7---7---9---9---9---9---12--12---11--11-|
E|-7---------------8--------5-------7---------------10-------9--------|

RIFF B:
E|-----------------------|
B|-----------------------|
G|-----------------------|
D|-2-----3--5-----6---0--|
A|-2-----3--5-----6---0--|
E|-----------------------|

RIFF C:
E|---------------------------------------------------------|
B|---------------------------------------------------------|
G|---------------------------------------------------------|
D|---------------------------------------------------------|
A|-2-------------5-------------6-------------5-------------|
E:-0-0-0-0-0-0-0-3-0-0-0-0-0-0-4-0-0-0-0-0-0-3-0-0-0-0-0-0-|
     x x x x x x   x x x x x x   x x x x x x   x x x x x x

RIFF D:
E|-------------------|-------------------------------------------------|
B|-------------------|-------------------------------------------------|
G|-------------------|-------------------------------------------------|
D|----3--------5-----|-------------------------------------------------|
A|-2--1--2--5--3--5--|---------1-1-1-1-----------------3-3-3-3---------|
E|-0-----0--3-----3--|-0-0-0-0---------0-0-0-0-3-3-3-3---------3-3-3-3-|
      ^        ^
      |        |
      See "Special Note" below!

RIFF E:
E|-------------------------------|
B|-------------------------------|
G|-------------------------------|
D|-------------------------------|
A|-8/5-------10------5-------5/6-|
E|-6/7--0-0--8--0-0--3--0-0--3/4-|

RIFF F:                                
E|---------------------------------------------------------------------|
B|---------------------------------------------------------------------|
G|---------------------------------------------------------------------|
D|---------------------------------------------------------------------|
A|---------------------------------------------------------------------|
E|-2-2-2-2-2-2-2-2--3-3-3-3--0-0-0-0--2-2-2-2-2-2-2-2--3-3-3-3-3-3-3-3-|
   x x x x x x x x  x x x x  x x x x  x x x x x x x x  x x x x x x x x

(Riff F Continued..)
E|---------------------------------------------------------------------|
B|---------------------------------------------------------------------|
G|---------------------------------------------------------------------|
D|---------------------------------------------------------------------|
A|---------------------------------------------------------------------|
E|-2-2-2-2-2-2-2-2--3-3-3-3--0-0-0-0--5-5-5-5-5-5-5-5--6-6-6-6-6-6-6-6-|
   x x x x x x x x  x x x x  x x x x  x x x x x x x x  x x x x x x x x


Missing Riff:

All with tremolo picking

E|-----------------|
B|-----------------|
G|-----------------|
D|-----------------|
A|-----7---6---5---|
E|-0-6---5---4---3-|

RIFF G:
E|----------------------------------------------------------|
B|----------------------------------------------------------|
G|----------------------------------------------------------|
D|---------------------5-4---3------------------------------|
A|-2---------2---------3-2-3-1--2---------2---------2-3-5-3-|
E|-0-0-0-0-0-0-0-0-0-0-----1----0-0-0-0-0-0-0-0-0-0-0-1-3-1-|
     x x x x   x x x x            x x x x   x x x x

                               *****************
                               **SPECIAL NOTE:**
******************************************************************************
Note that Obituary uses a lot of slight variations in their riffing.  One time
a riff may have a C5-chord like:  D:--5--
A:|--3--|
E:|-----|

Whereas, the next time around, they get more 'Grind' into it by using:
D|--5--|
A|--3--|
E|--3--| <-Add a 4th (is that right-'4th'?)