Industrial metal is the fusion of heavy metal and industrial music, typically employing repeating metal guitar riffs, sampling, synthesizer or sequencer lines, and distorted vocals. Prominent industrial metal acts include Ministry, Godflesh, Marilyn Manson, Rammstein, Fear Factory and Nine Inch Nails.Industrial metal developed in the late 1980s, as industrial and metal began to fuse into a common genre. Industrial metal did well in the early 1990s, particularly in North America, with the success of groups such as Nine Inch Nails. The industrial metal movement began to fade in the latter half of the 1990s.