Slipknot : inside the sickness, behind the masks

Slipknot are a highly controversial band who combine a talent for outrage with their music.

Reminiscent of the outlandishness of punk, "nu metal" has become the fastest growing area in rock music.

Despite ignoring every rule in the book and more besides, Slipknot sold over two million copies of their debut album.

Yet they spit, swear and risk injury night after night in their extraordinary live performances.

Their fans don't know what they look like, as the nine refuse to remove their trademark masks and boiler suits.

This biography describes the transformation of the men from Des Moines into unorthodox mega stars.