Trent Reznor's singular sound is a noisy mix of sinister atmospherics, chilly guitars, and dense sequencing. In addition to producing the murky nightmare of Nine Inch Nails' The Downward Spiral, he helped Marilyn Manson achieve peak creepiness on “Sweet Dreams (Are Made of This)” and mutated Karen O into a shrieking cyborg in the industrialized re-imagining of Zeppelin's “Immigrant Song.”