Mick: That's Country Joe McDonald's "I Feel Like I'm Fixing To Die Rag." The tune is the second half of the verse and the chorus of Muskrat Ramble. It goes:

Come on, all of you big strong men:
Uncle Sam needs your help again.
He's got himself in a hell of a jam
Way down yonder in Vietnam;
So put down your books, pick up a gun;
We're gonna have a whole lot of fun.

CHORUS: And it's one, two, three, what are we fighting for?
Don't ask me, I don't give a damn. Next stop is Vietnam.
And it's five, six, seven, open up your pearly gate,
There ain't no use to wonder why,
Whoopee, we're all going to die.

Come on, generals. Let's move fast.
Your big chance has come at last.
Now you can go out and get them Reds,
'Cause the only good commie is one that's dead,
But hope and pray when they drop the bomb,
They drop it on the Viet Cong.

Come on, mothers throughout this land,
Send your boys off to Vietnam.
Come on, fathers, don't hesitate.
Pack 'em off before it's too late,
And you can be the first ones in your blocks
To have your boy come home in a box.

There's one more verse about Wall Street, but I can't remember it.
--seed