Lou Reed, Metal Machine Music

Four equally divided amorphous portions of noise and feedback that are so interchangeable the extra quad mix channels were allegedly the same tape tracked in reverse. In this sense the locked groove of the original LP seems perfectly logical. What's really crazy is the damn thing is perversely listenable, at least at low volume in the background where it becomes part of the ambience. I don't know if I got the joke, and I'm quite sure RCA didn't, but somewhere Philip Glass is laughing. (Content: um.)