Here's a great song from "America Must Be Destroyed".
Beefcake on vocals and a riff similar to Nirvana's 
"Rape Me", but GWAR released this before Nirvana, 
so hahaha.

Intro/Verse
|---------------------------------|
|------xxxx-----------xxxx--------|
|--2-2-xxxx-5-5-0-----xxxx-5-5-0--|
|--2-2-xxxx-5-5-0-2-2-xxxx-5-5-0--|
|--0-0-xxxx-3-3-0-2-2-xxxx-3-3-0--|
|---------------0-0-0----------0--| x8
                ^              ^
         Do an upstroke on the bottom four strings

Chorus
|----------------------|
|----------------------|
|--7~~--9~~--7~~--5~~--|
|--7~~--9~~--7~~--5~~--|
|--5~~--7~~--5~~--3~~--|
|----------------------| x2

Verse    x8
Chorus   x2

Breakdown
(Just play the chord as much as you can, as fast as you can)
|--------------|
|--------------|
|--5555555555--|
|--5555555555--|
|--3333333333--|
|--------------|

Ending
|------------|
|------------|
|--2~~----2--|
|--2~~----2--|
|--0~~----0--|
|------------|

Legend
=======
x   | Mute Note
~   | Hold Note/Vibrato

That's it. Feedback is welcomed.