It say's on this very website that although Paul Johnson is credited as playing bass on the Rock the Nation album, in fact it was actually Biff who played all the bass parts.
Actually, although Paul Johnson gets credit for Biff's bass parts, I must take credit for having the ferocious bondage sex which inspired the Biffmeister. Without my guilded thrustings he would be nothing I tell you!!!!!!!!!!, NOTHING!!!!!!!!!!