On Sept. 16, 1969, Johnny Cash's "A Boy Named Sue" hit No. 1 on the country charts. By all accounts, the song is one of Cash's most iconic recordings. To this day, "A Boy Named Sue" permeates pop culture. Even if some folks don't realize where it came from. For the most part, the song was never meant for a widespread audience. That's probably because it deals with its main character trying to kill his father. But when Johnny Cash first performed the song live, he figured that kind of thing might resonate with his audience. Because the first time...