Pulling the harsh sounds of industrial rock into the mainstream, Trent Reznor and his band Nine Inch Nails became the face of industrial music in the '90s with "Head Like a Hole," "Closer," and "Hurt" becoming hits and The Downward Spiral (1994) and The Fragile (1999) topping the charts. Nominated for over a dozen Grammys, NIN won Best Metal Performance awards in 1992 and 1996 for two tracks -- "Wish" and "Happiness in Slavery" -- from their metallic EP Broken. Reznor maintained his chart success with 2005's With Teeth and 2007's Year Zero, just as the band's sound expanded to...