Ladies and gentlemen, from 1974, it's the Sensational Alex Harvey Band and their epic live version of "Midnight Moses."
These guys were absolutely huge in England during the Glam Era but were never more than a rumor here in the States, despite an amazing stage show (Harvey would put pantyhose over his head, jump into the audience and mug people in the first row). In any case, I think we can all agree that, for sheer de profundis, the following couplet from "Moses" may be the two most brilliant lines ever penned -- not just in rock history, but going back to the days in the dim dark past when people wrote stuff on clay tablets.
"I wish I was a forest ranger...
Danger, danger, danger."
In a similarly Spinal Tap-ish vein, it is perhaps worth noting that Harvey's brother Les, a member of British blues band Stone the Crows, had the misfortune to fry himself to death onstage as a result of touching an improperly grounded microphone.