Singer Johnny Cash heroically spoke out for Native Americans, the poor, and the incarcerated—but his personal life was like a black hole filled with scandal.

The story of how the closing track on Nine Inch Nails' second album, 'The Downward Spiral', came to be one of their most famous songs.

Though Trent Reznor may have penned "Hurt," the final song on Nine Inch Nails' 1994 album, The Downward Spiral, Johnny Cash ...