One of the most famous rock bands, Slipknot dominates almost all music charts in many countries. The latest album of Slipknot called All Hope Is Gone, released in 2008 is still one of the most loved rock albums today. Slipknot is an American heavy metal band, operating since 1995. The group wearing masks to avoid attracting public attention, but want people to focus on their music. The idea of using masks comes from a team member, and is used by the group. Later, the mask was designed to match the outfit.