"Past Present and Future" by Demon Fuzz
How can you not like a band called Demon Fuzz? Seriously though, their brand of psychedelic, proto-metal, afropop funk is pretty irresistible. It's as funky as it is heavy, and it's very, very heavy. This song, an instrumental that came out in the '70s, starts off as a massive stoner-metal guitar anthem before blossoming into a horn-laden funk jam. It swings like that for a few minutes, and it's so much fun. And then it gets pretty heavy again. Demon Fuzz, oh how we miss thee.