10 Incredible Songs From Musicians Who Knew They Were Dying

"Everyone I know. Goes away in the end."

Some may consider this a cheat considering it's a cover of a Nine Inch Nails song, but subtle lyrical changes along with where Cash was in his life and the accompanying video makes this one of the most emotional pieces of music ever produced.

Cash was a celebrated country and Americana singer who had been performing since the '50s. An iconic voice, look and knack for songwriting made him one of - if not the - biggest crossover stars in country music.

After being one of several country musicians to suffer from drastic changes to the music industry in the early '90s, Cash signed a deal with American Records and worked almost exclusively with famed producer Rick Rubin. The signing resulted in a career rejuvenation for Cash, despite his accruing health issues.

By the time of 2003's American IV, Cash was fading. Facing a race against time, director Mark Romanek managed to get Cash and a crew to the derelict House of Cash museum. Shots of the vast empty space, broken memorabilia, a frail Cash, all juxtaposed by highlights of his incredible career changes the context of the lyrics to a man a once covered in glory to now struggling and hurting.

NIN leader Trent Reznor in response to the cover said "[I felt like] I just lost my girlfriend, because that song isn't mine anymore..."