Rock it out!
The tabs on the web seem to do one of the two following things:
G D C C/B C/A G
Keep on rockin' in the free world,
G D C C Em
Keep on rockin' in the free world
(Sorry 'bout the chord spacing in that text - can't seem to fix that but, hopefully, you get what I mean.)
I found that what works at the end of each chorus line is C, with walk down on A string 2nd fret, to an open E major.
There are places in the song where barre chords fit the chorus (i.e. first half of lead break) but, for the most part, it seems to resonate with best heaviness on open chords.
Seize the Fish
'70s Univox LP Copy