A genuine sonic phenomenon, a nine-piece force of nature and one of heavy music's most important, recognizable, uncompromising and creatively ingenious bands. Yet to their millions of fans across the world, affectionately known as maggots, SLIPKNOT aren't just a group, they re also a counterculture and a way of life. Those fans play an important role in a new documentary entitled 'Day of The Gusano'.