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thumb|300px|right|secret 'knot songOkay, here goes. The song (515) is the intro track on slipknot's iowa album. It's Sid Wilson (DJ) having an outburst played backwards. There is also a supposed secret 'Knot song called 0826. I have the videos 4 both. Watch.thumb|300px|right|this is the link to 515 backwards