Alice Cooper’s debut—a dark, grainy maze of psych rock and avant-garde experimentation—is one of the most intense mind-scramblers of late-’60s underground rock. Before writing the fist-pumping anthems that made them arena stars, the sonic troublemakers created third-eye acid rockers from violent percussiveness and erratic time changes (“Swing Low, Sweet Cheerio”), spaced-out jams soaked in fuzz guitars and harmonies melting like Dalí clocks (“Reflected”) and spazzy blasts of Syd Barrett–inspired freak pop that end before you even know what obliterated you (“Earwigs to Eternity”).