Before the terms heavy metal or stoner metal came into parlance, San Francisco’s Blue Cheer was altering impressionable young minds with its classic debut record, Vincebus Eruptum, a dangerous dose of fuzz-toned, drugged-out psychedelic blues, enormous, sludgy riffs, scary distortion and impenetrable volume that vomited the Top 40 remake of Eddie Cochran’s “Summertime Blues.”