Blue Cheer looms large in the annals of hard rock, laying down the sonic foundations of heavy metal, and serving as a crucial influence on the birth of punk, grunge and stoner rock. While the rest of the rock world was mellowing out and embracing the spirit of the Summer of Love, the seminal San Francisco power trio was churning out ballsy blues-rock anthems whose fuzz-heavy, adrenaline-charged intensity helped to alter the course of contemporary music.