I'll warn you right now, the level of guitar and moog wank in this clip is off the fucking scale. But it rocks like a fucking mountain, which is why I'm posting it. Yes, I know it's Journey, but, and this is the important bit, it's long before they went pop (although most of the early stuff is still hideous) and not long after Greg Rolie and the other bloke left Santana*, probably because Carlos wouldn't let him play his moog like he does in the second song here. There's no excuse for this sort of behaviour really, but when it's done with this level of intensity, and accompanied by some of the funniest fucking facial expressions of profound ecstasy in the history of music, it's irresistible, like a dirty kebab after fourteen pints of scrumpy.
Skip ahead to 4.20 and 9.30 for the really good shit...
Christ, it's like a fucking cross between early ZZ Top and Goblin.
*The bass player and rhythm guitarist were previously in the sorely fucking underrated Frumious Bandersnatch, psych fans!