During the '70s, workdays at Umiliani's Sound Workshop were hectic; thousands of sessions were held in order to keep up with the busy Italian movie industry. Hundreds of soundtracks were recorded and released in very limited quantities. Those LPs are now very collectible and extremely hard to find. Filled with hypnotic bass lines, heavy drums and screaming fuzz guitars "Underground", the first LP of the fictitious group known as Braen's Machine, is one of the rarest and most expensive of them all.