Valued Commentator JES, whose writing can be found here, adds far more than two cents when he reminds us that P-Funk could do Led Zeppelin a hell of a lot better than Zep could. Bernie’s on the Hammond B3, and if anyone else played the same notes he chose, the notes would be wrong. Bernie made the dissonance work, though: check out the demonic calliope at a minute in.
(By the way: Eddie Hazel was the greatest guitarist of all time. No “Best EVAR” snark. He just was.)