Lou Reed's 1975 dive into avant-garde guitar noise still bites like a rattle snake -- you either succumb to it in a shocked state or you flee in terror and try to get the poison out of your system. Even Reed remains divided on Machine, saying it was a serious artistic endeavor one day and then claiming it was a creative attempt to get dropped by his record company the next. Decades later, Metal Machine Music is rightly considered a boho classic, but even its supporters don't listen to it that often. Play it for the entire hour with headphones on...we dare you. You might not survive the experience.