Rock & roll had grown louder and wilder by leaps and bounds during the '60s, but when Blue Cheer emerged from San Francisco onto the national rock scene in 1968 with their debut album, Vincebus Eruptum, they crossed a line which most musicians and fans hadn't even thought to draw yet. Vincebus Eruptum sounds monolithically loud and primal today, but it must have seemed like some sort of frontal assault upon first release; Blue Cheer are often cited as the first genuine heavy metal band, but that in itself doesn't quite sum up the true impact of this music, which even at a low volume sounds crushingly forceful. Though Blue Cheer's songs were primarily rooted in the blues, what set them apart from blues-rock progenitors such as the Rolling Stones and the Yardsbirds was the massive physical force of their musical attack. Vincebus Eruptum is a glorious celebration of rock & roll primitivism run through enough Marshall amps to deafen an army; only a few of Blue Cheer's peers could come up with anything remotely this heavy and no one could summon so much thunder with just three people. If you want to wake the neighbors, this is still the album to get, and it was Blue Cheer's simplest and most forceful musical statement.