The Rugbys - "You, I"
1969
This scrappy little regional hit that went big nationally upon re-release packs so much into three minutes. Starts out with fuzz guitar AND a smoker's cough*. (Predating Black Sabbath's "Sweet Leaf"!) BOOM: hard rock, scratchy guitar, sparse glorious production, blue-eyed-tinged vocals, proto-Uriah Heep "ahhhhh"s. Then it gets even more urgent, adds fast pulsating keyboards. The end approaches and before you get a chance to play it over (and over and over) again it slows down into wah-wah guitar and drum roll, like The Rugbys want to take a shot at being metal pioneers. As Wikipedia advises: Check out the 1969 Palm Beach Music Festival poster.
*Alas, not heard on any YouTube version I tracked. Trust me, it's very clear on Apple Music.